561
Everything about the number 561 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 561
| Nominal | 561 |
| Cardinal | five hundred sixty-one |
| Ordinal | 561st |
| This number as US currency | five hundred sixty-one dollars |
Properties (and some facts) of 561
| 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 |
| Is 561 a triangle number? | 561 is a triangle number |
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561 in other bases
| Base 2 (Binary) | 1000110001 |
| Base 3 (Ternary) | 202210 |
| Base 4 (Quaternary) | 20301 |
| Base 5 (Quinary) | 4221 |
| Base 6 (Senary) | 2333 |
| Base 8 (Octal) | 1061 |
| Base 12 (Duodecimal) | 3A9 |
| Base 16 (Hexadecimal) | 231 |
| Base 20 (Vigesimal) | 181 |
Primes and factors tests for 561
| Is 561 a prime number? | 561 is not a prime number |
| 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 |
561 in other numeral systems
| 561 in Roman numerals | DLXI |
| 561 in Chinese numerals | 伍佰陸拾壹 |
| 561 in Babylonian numerals |   |
| 561 in Egyptian numerals | 𓍦𓎋𓏺 |
Roots and squares 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 561 | 23.685438564654 |
| Cube root of 561 | 8.2474739741226 |
Recreational math for 561
| Number 561 reversed | 165 |
| Sum of the digits | 12 |
| Number of digits | 3 |
Arithmetic tables for 561
Other pages about 561
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