Names of 561
| Nominal | 561 |
| Cardinal | five hundred sixty-one |
| Ordinal | 561st |
| This number as US currency | five hundred sixty-one dollars |
| Is 561 an odd number? | 561 is an odd number |
| Is 561 an even number? | 561 is NOT an even number |
| Is 561 a palindrome? | 561 is NOT a palindrome number |
| Is 561 a triangle number? | 561 is a triangle number |
561 in other Bases
| Base 2 (Binary) | 10001100012 |
| Base 3 (Ternary) | 2022103 |
| Base 4 (Quaternary) | 203014 |
| Base 5 (Quinary) | 42215 |
| Base 6 (Senary) | 23336 |
| Base 8 (Octal) | 10618 |
| Base 12 (Duodecimal) | 3A912 |
| Base 16 (Hexadecimal) | 23116 |
| Base 20 (Vigesimal) | 18120 |
Primes and Factors tests for 561
| Is 561 a Prime Number? | 561 is NOT a prime |
| Is 561 a perfect number? | 561 is NOT a perfect number |
| Is 561 a Mersenne Prime? | 561 is NOT a Mersenne prime |
| Is 561 a Fermat Prime? | 561 is NOT a Fermat prime |
| Is 561 a Fibonacci Prime? | 561 is NOT a Fibonacci prime |
| Is 561 a Partition Prime? | 561 is NOT a Partition prime |
| Is 561 a Pell Prime? | 561 is NOT a Pell prime |
| Prime Factors | Prime factors of 561 |
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561 in other Numerals
| 561 in Roman Numeral | DLXI |
| 561 in Chinese Numeral | 伍佰陸拾壹 |
| 561 in Egyptian Numeral | 𓍦𓎋𓏺 |
| 561 in Babylonian Numeral |   |
Roots and stuff for 561
| Is 561 a square number? | 561 is NOT a square number |
| Is 561 a cube number? | 561 is NOT a cube number |
| Square root of the number 561 | 23.685438564654 |
| Cube root of the number 561 | 8.2474739741226 |
Recreational math for 561
| Number 561 reversed | 165 |
| Sum of the digits | 12 |
| No of digits | 3 |