130 (number)

← 129 130 131 →
← 130 131 132 133 134 135 136 137 138 139 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred thirty
Ordinal	130th (one hundred thirtieth)
Factorization	2 × 5 × 13
Divisors	1, 2, 5, 10, 13, 26, 65, 130
Greek numeral	ΡΛ´
Roman numeral	CXXX, cxxx
Binary	100000102
Ternary	112113
Senary	3346
Octal	2028
Duodecimal	AA12
Hexadecimal	8216

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. ^[1]

130 equals both 2⁷ + 2 and 5³ + 5 and is therefore a doubly strictly adsurd number. ^[2]

In other fields

• A 130-30 fund or a ratio up to 150/50 is a type of collective investment vehicle

References

1. MathWorld - Hexagonal Number
2. Mackenzie, Dana (March 2018). "2184: An Absurd (and Adsurd) Tale". Integers. 18.