Number 51

A page of the Numeropedia - the Special Encyclopedia of Numbers

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[Calendar]  The minimum number of complete (full) weeks within in a calendar year.

 

[Chemistry]  The atomic number of Antimony (Sb).

 

[Tech.]  51(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%). 51pF (picofarads) is one of standard numerical values for capacitors.

 

[Math.]  Its odd powers end with 51. Its even powers end with 01.

 

[Math.]  513 = 132,651 = (–13–2+65+1)3 = (–1–3–2+6+51)3.

 

[Math.]  A regular polygon with this odd number (product of Fermat prime numbers) of sides is constructible by using only straightedge and compass. 51 = 3´17.

 

[Money]  A MasterCard credit card number starts with either 2 digits 51, 52, 53, 54 or 55.

 

[Movie]  Name of TV show/series/movies: “The 51st State” and “Showdown at Area 51”.

 

[Phone]  International telephone dialing code for Peru.

 

[Phone]  The emergency telephone number dialing within Moscow, Russia.

 

[Science] The number 1051 is sexdecillion, in American system. In British system, sexdecillion is 1096.

 

[Trivia]  U.S. Air Force’s secret test facility at Groom Lake, Nevada is usually referred as “Area 51”.

 

 [World]  The ISO-3166 country code for Armenia is 051.