| ||||
|---|---|---|---|---|
| Cardinal | two hundred fifty-one | |||
| Ordinal | 251st (two hundred fifty-first) | |||
| Factorization | prime | |||
| Prime | 54th | |||
| Greek numeral | ΣΝΑ´ | |||
| Roman numeral | CCLI | |||
| Binary | 111110112 | |||
| Ternary | 1000223 | |||
| Senary | 10556 | |||
| Octal | 3738 | |||
| Duodecimal | 18B12 | |||
| Hexadecimal | FB16 | |||
251 (two hundred [and] fifty-one) is the natural number between 250 and 252. It is also a prime number.