Names of 2561
| Nominal | 2561 |
| Cardinal | two thousand five hundred sixty-one |
| Ordinal | 2,561st |
| This number as US currency | two thousand five hundred sixty-one dollars |
| Is 2561 an odd number? | 2561 is an odd number |
| Is 2561 an even number? | 2561 is NOT an even number |
| Is 2561 a palindrome? | 2561 is NOT a palindrome number |
| Is 2561 a triangle number? | 2561 is NOT a triangle number |
2561 in other Bases
| Base 2 (Binary) | 1010000000012 |
| Base 3 (Ternary) | 101112123 |
| Base 4 (Quaternary) | 2200014 |
| Base 5 (Quinary) | 402215 |
| Base 6 (Senary) | 155056 |
| Base 8 (Octal) | 50018 |
| Base 12 (Duodecimal) | 159512 |
| Base 16 (Hexadecimal) | A0116 |
| Base 20 (Vigesimal) | 68120 |
Primes and Factors tests for 2561
| Is 2561 a Prime Number? | 2561 is NOT a prime |
| Is 2561 a perfect number? | 2561 is NOT a perfect number |
| Is 2561 a Mersenne Prime? | 2561 is NOT a Mersenne prime |
| Is 2561 a Fermat Prime? | 2561 is NOT a Fermat prime |
| Is 2561 a Fibonacci Prime? | 2561 is NOT a Fibonacci prime |
| Is 2561 a Partition Prime? | 2561 is NOT a Partition prime |
| Is 2561 a Pell Prime? | 2561 is NOT a Pell prime |
| Prime Factors | Prime factors of 2561 |
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2561 in other Numerals
| 2561 in Roman Numeral | MMDLXI |
| 2561 in Chinese Numeral | 貳仟伍佰陸拾壹 |
| 2561 in Egyptian Numeral | 𓆽𓍦𓎋𓏺 |
| 2561 in Babylonian Numeral |   |
Roots and stuff for 2561
| Is 2561 a square number? | 2561 is NOT a square number |
| Is 2561 a cube number? | 2561 is NOT a cube number |
| Square root of the number 2561 | 50.60632371552 |
| Cube root of the number 2561 | 13.681588566478 |
Recreational math for 2561
| Number 2561 reversed | 1652 |
| Sum of the digits | 14 |
| No of digits | 4 |