561 (number)
561 is the natural number following 560 and followed by 562.
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| Cardinal | five hundred sixty-one | ||
| Ordinal | 561st | ||
| Factorization | <math>3 \cdot 11 \cdot 17<math> | ||
| Roman numeral | DLXI | ||
| Binary | 1000110001 | ||
| Hexadecimal | 231 | ||
In mathematics
561 is the smallest Carmichael number.
Categories: Number stubs | Integers