The 51 (number) reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

51 (number)

51 is the natural number following 50 and preceding 52.

List of numbers — Integers << 50 51 52 53 54 55 56 57 58 59 >>
Cardinal	fifty-one
Ordinal	51st (fifty-first)
Factorization
Roman numeral	LI
Binary	110011
Hexadecimal	33

Fifty-one is a pentagonal number and an octodecagonal number.

It is also:

• the atomic number of antimony.
• the code for international direct dial phone calls to Peru.
• the model number of the P-51 Mustang WWII fighter aircraft
• part of the title of a collection of stories by Lord Dunsany, Fifty-One Tales.
• The year AD 51, 51 BC, and 1951.

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