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Natural number From Wikipedia, the free encyclopedia
129 (one hundred [and] twenty-nine) is the natural number following 128 and preceding 130.
| ||||
---|---|---|---|---|
Cardinal | one hundred twenty-nine | |||
Ordinal | 129th (one hundred twenty-ninth) | |||
Factorization | 3 × 43 | |||
Divisors | 1, 3, 43, 129 | |||
Greek numeral | ΡΚΘ´ | |||
Roman numeral | CXXIX | |||
Binary | 100000012 | |||
Ternary | 112103 | |||
Senary | 3336 | |||
Octal | 2018 | |||
Duodecimal | A912 | |||
Hexadecimal | 8116 |
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: , , , and .
129 is the product of only two primes, 3 and 43, making 129 a semiprime. Since 3 and 43 are both Gaussian primes, this means that 129 is a Blum integer.[1]
129 is a repdigit in base 6 (333).
129 is a happy number.[2]
129 is a centered octahedral number.[3]
129 is also:
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