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129 is the natural number following 128 and preceding 130.
| #REDIRECT Numbers (120s) | |
| Cardinal | One hundred [and] twenty-nine |
| Ordinal | 129th |
| Factorization | |
| Roman numeral | CXXIX |
| Binary | 10000001 |
| Hexadecimal | 81 |
This number 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 and and .
One hundred twenty-nine is also:
This page discusses the number 129. For the year, see 129.