130 (number)

130 (number)
← 129
131 →
130
Cardinal one hundred [and] thirty
Ordinal 130th
(one hundred [and] thirtieth)
Factorization 2 \cdot 5 \cdot 13
Divisors 1, 2, 5, 10, 13, 26, 65, 130
Roman numeral CXXX
Binary 100000102
Octal 2028
Duodecimal AA12
Hexadecimal 8216

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

Contents

In mathematics

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

One hundred [and] thirty is also:

References

  1. ^ MathWorld - Hexagonal Number

See also


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