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# 251 (number)

 ← 250 251 252 →
Cardinaltwo hundred fifty-one
Ordinal251st
(two hundred fifty-first)
Factorizationprime
Prime54th
Greek numeralΣΝΑ´
Roman numeralCCLI
Binary111110112
Ternary1000223
Quaternary33234
Quinary20015
Senary10556
Octal3738
Duodecimal18B12
VigesimalCB20
Base 366Z36

251 (two hundred [and] fifty-one) is the natural number between 250 and 252. It is also a prime number.

## In mathematics

251 is:

Every 5 × 5 matrix has exactly 251 square submatrices.[6]

## References

1. ^ Sloane, N. J. A. (ed.). "Sequence A005384 (Sophie Germain primes p: 2p+1 is also prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. ^
3. ^ Kozek, Mark Robert (2007), Applications of Covering Systems of Integers and Goldbach's Conjecture for Monic Polynomials, PhD dissertation, University of South Carolina, p. 14, ISBN 9780549210207.
4. ^
5. ^ De Koninck, Jean-Marie (2009), Those fascinating numbers, Providence, RI: American Mathematical Society, p. 64, ISBN 978-0-8218-4807-4, MR 2532459.
6. ^
7. ^ Californium - Element Information, Properties and Uses Periodic Table., Royal Society of Chemistry.