130 (one hundred [and] thirty) is the natural number following 129 and preceding 131.
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.MathWorld - Hexagonal Number
130 equals both 27 + 2 and 53 + 5 and is therefore a doubly strictly number.
There is no value between 130 and 4 × 130 = 520, such that 2n − 1, the nth Mersenne number, is prime. As of February 2026, 130 is the largest known integer with this property.
In other fields A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle
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