129 (number)
Encyclopedia : 1 : 12 : 129 : 129 (number)
129 is the natural number following 128 and preceding 130.
| Cardinal | One hundred [and] twenty-nine |
| Ordinal | 129th |
| Factorization | [3\cdot43] |
| Roman numeral | CXXIX |
| Binary | 10000001 |
| Hexadecimal | 81 |
In mathematics
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: [11^2+2^2+2^2] and [10^2+5^2+2^2] and [8^2+8^2+1^2] and [8^2+7^2+4^2].129 is a repdigit in base 6 (333).
In other fields
One hundred [and] twenty-nine is also:- The designation of a spur route of Interstate 29 in Sioux City, Iowa.
- The year AD 129 or 129 BC.
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