231 (number)

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← 230 231 232 →
Cardinal two hundred thirty-one
Ordinal 231st
(two hundred and thirty-first)
Factorization 3 × 7 × 11
Roman numeral CCXXXI
Binary 111001112
Ternary 221203
Quaternary 32134
Quinary 14115
Senary 10236
Octal 3478
Duodecimal 17312
Hexadecimal E716
Vigesimal BB20
Base 36 6F36

231 (two hundred [and] thirty-one) is the natural number following 230 and preceding 232.

In mathematics[edit]

Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, hexagonal number, octahedral number,[1] centered octahedral number,[2] the number of integer partitions of 16, Mertens function returns 0,[3] and is the number of cubic inches in a U.S. liquid gallon.

In chemistry[edit]

In other fields[edit]

231 is:

References[edit]

  1. ^ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24. 
  2. ^ "Sloane's A001845 : Centered octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24. 
  3. ^ "Sloane's A028442 : Numbers n such that Mertens' function is zero". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-24.