129 (number)

← 128 129 130 →
← 120 121 122 123 124 125 126 127 128 129 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred twenty-nine
Ordinal	129th (one hundred twenty-ninth)
Factorization	3 × 43
Divisors	1, 3, 43, 129
Roman numeral	CXXIX
Binary	100000012
Ternary	112103
Quaternary	20014
Quinary	10045
Senary	3336
Octal	2018
Duodecimal	A912
Hexadecimal	8116
Vigesimal	6920
Base 36	3L36

129 (one hundred [and] twenty-nine) is the natural number following 128 and preceding 130.

129 is the sum of the first ten prime numbers. It is the smallest number that can be expressed as a sum of three squares in four different ways: ${\displaystyle 11^{2}+2^{2}+2^{2}}$, ${\displaystyle 10^{2}+5^{2}+2^{2}}$, ${\displaystyle 8^{2}+8^{2}+1^{2}}$, and ${\displaystyle 8^{2}+7^{2}+4^{2}}$.

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