Names of 6561
| Nominal | 6561 |
| Cardinal | six thousand five hundred sixty-one |
| Ordinal | 6,561st |
| This number as US currency | six thousand five hundred sixty-one dollars |
| Is 6561 an odd number? | 6561 is an odd number |
| Is 6561 an even number? | 6561 is NOT an even number |
| Is 6561 a palindrome? | 6561 is NOT a palindrome number |
| Is 6561 a triangle number? | 6561 is NOT a triangle number |
6561 in other Bases
| Base 2 (Binary) | 11001101000012 |
| Base 3 (Ternary) | 1000000003 |
| Base 4 (Quaternary) | 12122014 |
| Base 5 (Quinary) | 2022215 |
| Base 6 (Senary) | 502136 |
| Base 8 (Octal) | 146418 |
| Base 12 (Duodecimal) | 396912 |
| Base 16 (Hexadecimal) | 19A116 |
| Base 20 (Vigesimal) | G8120 |
Primes and Factors tests for 6561
| Is 6561 a Prime Number? | 6561 is NOT a prime |
| Is 6561 a perfect number? | 6561 is NOT a perfect number |
| Is 6561 a Mersenne Prime? | 6561 is NOT a Mersenne prime |
| Is 6561 a Fermat Prime? | 6561 is NOT a Fermat prime |
| Is 6561 a Fibonacci Prime? | 6561 is NOT a Fibonacci prime |
| Is 6561 a Partition Prime? | 6561 is NOT a Partition prime |
| Is 6561 a Pell Prime? | 6561 is NOT a Pell prime |
| Prime Factors | Prime factors of 6561 |
Sponsored
6561 in other Numerals
| 6561 in Roman Numeral | VMDLXI |
| 6561 in Chinese Numeral | 陸仟伍佰陸拾壹 |
| 6561 in Egyptian Numeral | 𓇁𓍦𓎋𓏺 |
| 6561 in Babylonian Numeral |    |
Roots and stuff for 6561
| Is 6561 a square number? | 6561 is a square number |
| Is 6561 a cube number? | 6561 is NOT a cube number |
| Square root of the number 6561 | 81 |
| Cube root of the number 6561 | 18.720754407467 |
Recreational math for 6561
| Number 6561 reversed | 1656 |
| Sum of the digits | 18 |
| No of digits | 4 |