555 (number)
Encyclopedia
555 is the natural number
following 554 and preceding 556.
.
In base 10, it is a repdigit
, and because it is divisible by the sum of its digits, it is a Harshad number
. It is also a Harshad number in binary
, base 11, base 13 and hexadecimal
.
Natural number
In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...
following 554 and preceding 556.
Mathematical properties
It is a sphenic numberSphenic number
In number theory, a sphenic number is a positive integer which is the product of three distinct prime numbers.Note that this definition is more stringent than simply requiring the integer to have exactly three prime factors; e.g. 60 = 22 × 3 × 5 has exactly 3 prime factors, but is not sphenic.All...
.
In base 10, it is a repdigit
Repdigit
In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system....
, and because it is divisible by the sum of its digits, it is a Harshad number
Harshad number
A Harshad number, or Niven number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers were defined by D. R. Kaprekar, a mathematician from India. The word "Harshad" comes from the Sanskrit + , meaning joy-giver. The Niven...
. It is also a Harshad number in binary
Binary numeral system
The binary numeral system, or base-2 number system, represents numeric values using two symbols, 0 and 1. More specifically, the usual base-2 system is a positional notation with a radix of 2...
, base 11, base 13 and hexadecimal
Hexadecimal
In mathematics and computer science, hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F to represent values ten to fifteen...
.
Electronics
- 555 timer IC555 timer ICThe 555 timer IC is an integrated circuit used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. , it was estimated that 1 billion units are manufactured every year.- Design :The IC...
, a classic integrated circuitIntegrated circuitAn integrated circuit or monolithic integrated circuit is an electronic circuit manufactured by the patterned diffusion of trace elements into the surface of a thin substrate of semiconductor material...
chip that has numerous timerTimerA timer is a specialized type of clock. A timer can be used to control the sequence of an event or process. Whereas a stopwatch counts upwards from zero for measuring elapsed time, a timer counts down from a specified time interval, like an hourglass.Timers can be mechanical, electromechanical,...
and multivibratorMultivibratorA multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. It is characterized by two amplifying devices cross-coupled by resistors or capacitors...
applications, and historically widely used in electronicsElectronicsElectronics is the branch of science, engineering and technology that deals with electrical circuits involving active electrical components such as vacuum tubes, transistors, diodes and integrated circuits, and associated passive interconnection technologies...
Other fields
Five hundred [and] fifty five is:- The years AD 555555Year 555 was a common year starting on Friday of the Julian calendar. The denomination 555 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Asia :* The Nan Liang Dynasty begins; the first ruler...
and 555 BC. - The telephone exchange for fictitious phone numbers in US movieFilmA film, also called a movie or motion picture, is a series of still or moving images. It is produced by recording photographic images with cameras, or by creating images using animation techniques or visual effects...
s and computer games- see 555 (telephone number) and North American Numbering PlanNorth American Numbering PlanThe North American Numbering Plan is an integrated telephone numbering plan administered by Neustar which encompasses 24 countries and territories, including the United States and its territories, Canada, Bermuda, and 16 nations of the Caribbean...
. - The number of keyboard sonatas written by Domenico ScarlattiDomenico ScarlattiGiuseppe Domenico Scarlatti was an Italian composer who spent much of his life in the service of the Portuguese and Spanish royal families. He is classified as a Baroque composer chronologically, although his music was influential in the development of the Classical style...
, according to the catalog by Ralph Kirkpatrick. - A musical piece by Frank ZappaFrank ZappaFrank Vincent Zappa was an American composer, singer-songwriter, electric guitarist, record producer and film director. In a career spanning more than 30 years, Zappa wrote rock, jazz, orchestral and musique concrète works. He also directed feature-length films and music videos, and designed...
(Five-Five-FIVE). It refers to the time signatureTime signatureThe time signature is a notational convention used in Western musical notation to specify how many beats are in each measure and which note value constitutes one beat....
of the composition (5/8 - 5/8 - 5/4). - The Thai version of lolLOLLOL is an acronym or abbreviation of "laughing out loud", "lots of luck", or "lots of love". In medical slang, it is used as an acronym for "little old lady", a reference to the novel House of God.LOL or Lol may also refer to:...
in a text conversation. "5" in Thai is pronounced "ha," so three of them would be "hahaha." - The approximate height of the Washington MonumentWashington MonumentThe Washington Monument is an obelisk near the west end of the National Mall in Washington, D.C., built to commemorate the first U.S. president, General George Washington...
in feet. - Adolf HitlerAdolf HitlerAdolf Hitler was an Austrian-born German politician and the leader of the National Socialist German Workers Party , commonly referred to as the Nazi Party). He was Chancellor of Germany from 1933 to 1945, and head of state from 1934 to 1945...
's DAPGerman Workers' PartyThe German Workers' Party was the short-lived predecessor of the Nazi Party .-Origins:The DAP was founded in Munich in the hotel "Fürstenfelder Hof" on January 5, 1919 by Anton Drexler, a member of the occultist Thule Society. It developed out of the "Freien Arbeiterausschuss für einen guten...
registration number. He was actually the 55th member, as the founders began registering with 500 to make it appear as if there were many more people in the party ranks than there actually were. - The Greek gematrical equivalent to the word NecronomiconNecronomiconThe Necronomicon is a fictional grimoire appearing in the stories by horror writer H. P. Lovecraft and his followers. It was first mentioned in Lovecraft's 1924 short story "The Hound", written in 1922, though its purported author, the "Mad Arab" Abdul Alhazred, had been quoted a year earlier in...
, according to SimonSimonSimon is a common name, from Hebrew meaning "He who has heard/hears [the word of God]".Simon may also refer to:-Names:* Simon , including a list of people with the given name Simon...
. - Kamen Rider 555Kamen Rider 555is a Japanese tokusatsu television series. It is the 13th installment in the Kamen Rider Series. It is a joint collaboration between Ishimori Productions and Toei, and was broadcast on TV Asahi from January 26, 2003 to January 18, 2004...
, a JapanJapanJapan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...
ese tokusatsuTokusatsuis a Japanese term that applies to any live-action film or television drama that usually features superheroes and makes considerable use of special effects ....
TV series, where "555" is read as "'s," "Phi's," or "Faiz." - CigaretteCigaretteA cigarette is a small roll of finely cut tobacco leaves wrapped in a cylinder of thin paper for smoking. The cigarette is ignited at one end and allowed to smoulder; its smoke is inhaled from the other end, which is held in or to the mouth and in some cases a cigarette holder may be used as well...
brand, see State Express 555State Express 555State Express 555 is a brand of cigarette manufactured by British American Tobacco. It was first launched in 1895 and is a very popular brand in Asia, especially China where it is BAT's most popular brand.-Sponsorship:... - 5:555:55- Bonus tracks :On some releases one or two bonus tracks were added, for details see release history.-Personnel:* Charlotte Gainsbourg – vocals* Jean-Benoît Dunckel – piano, organ, synthesizer, glockenspiel, vibraphone, backing vocals, synth drums...
is the second albumAlbumAn album is a collection of recordings, released as a single package on gramophone record, cassette, compact disc, or via digital distribution. The word derives from the Latin word for list .Vinyl LP records have two sides, each comprising one half of the album...
by FrenchFranceThe French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...
musicianMusicianA musician is an artist who plays a musical instrument. It may or may not be the person's profession. Musicians can be classified by their roles in performing music and writing music.Also....* A person who makes music a profession....
and actress Charlotte GainsbourgCharlotte GainsbourgCharlotte Lucy Gainsbourg is an Anglo-French actress and singer. After releasing an album with her father at the age of fifteen, more than twenty years passed before she released two albums as an adult to commercial and critical success...
. "5:55" is also the first song on this album.
External links
- 555-LIST list of fictional phone numbers
- http://black-goat.com/song_iowa.php explanation of the song 'Heretic Anthem' by SlipknotSlipknot (band)Slipknot is an American heavy metal band from Des Moines, Iowa. Formed in 1995, the group was founded by percussionist Shawn Crahan and bassist Paul Gray...
which features 555 in the lyrics