| ||||
|---|---|---|---|---|
| Cardinal | two hundred eighty-one | |||
| Ordinal | 281st (two hundred eighty-first) | |||
| Factorization | prime | |||
| Prime | 60th | |||
| Greek numeral | ΣΠΑ´ | |||
| Roman numeral | CCLXXXI | |||
| Binary | 1000110012 | |||
| Ternary | 1011023 | |||
| Senary | 11456 | |||
| Octal | 4318 | |||
| Duodecimal | 1B512 | |||
| Hexadecimal | 11916 | |||
281 is the natural number following 280 and preceding 282. It is also a prime number.