130 (number)

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129 130 131
Cardinal one hundred thirty
Ordinal 130th
(one hundred and thirtieth)
Factorization 2 × 5 × 13
Divisors 1, 2, 5, 10, 13, 26, 65, 130
Roman numeral CXXX
Binary 100000102
Ternary 112113
Quaternary 20024
Quinary 10105
Senary 3346
Octal 2028
Duodecimal AA12
Hexadecimal 8216
Vigesimal 6A20
Base 36 3M36

130 (one hundred [and] thirty) is the natural number following 129 and preceding 131.

In mathematics[edit]

130 is a sphenic number. It is a noncototient since there is no answer to the equation x - φ(x) = 130.

130 is the only integer that is the sum of the squares of its first four divisors, including 1: 12 + 22 + 52 + 102 = 130.

130 is the largest number that cannot be written as the sum of four hexagonal numbers.[1]

In other fields[edit]

One hundred [and] thirty is also:

References[edit]

  1. ^ MathWorld - Hexagonal Number

See also[edit]