Names of 261
| Nominal | 261 |
| Cardinal | two hundred sixty-one |
| Ordinal | 261st |
| This number as US currency | two hundred sixty-one dollars |
| Is 261 an odd number? | 261 is an odd number |
| Is 261 an even number? | 261 is NOT an even number |
| Is 261 a palindrome? | 261 is NOT a palindrome number |
| Is 261 a triangle number? | 261 is NOT a triangle number |
261 in other Bases
| Base 2 (Binary) | 1000001012 |
| Base 3 (Ternary) | 1002003 |
| Base 4 (Quaternary) | 100114 |
| Base 5 (Quinary) | 20215 |
| Base 6 (Senary) | 11136 |
| Base 8 (Octal) | 4058 |
| Base 12 (Duodecimal) | 19912 |
| Base 16 (Hexadecimal) | 10516 |
| Base 20 (Vigesimal) | D120 |
Primes and Factors tests for 261
| Is 261 a Prime Number? | 261 is NOT a prime |
| Is 261 a perfect number? | 261 is NOT a perfect number |
| Is 261 a Mersenne Prime? | 261 is NOT a Mersenne prime |
| Is 261 a Fermat Prime? | 261 is NOT a Fermat prime |
| Is 261 a Fibonacci Prime? | 261 is NOT a Fibonacci prime |
| Is 261 a Partition Prime? | 261 is NOT a Partition prime |
| Is 261 a Pell Prime? | 261 is NOT a Pell prime |
| Prime Factors | Prime factors of 261 |
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261 in other Numerals
| 261 in Roman Numeral | CCLXI |
| 261 in Chinese Numeral | 貳佰陸拾壹 |
| 261 in Egyptian Numeral | 𓍣𓎋𓏺 |
| 261 in Babylonian Numeral |   |
Roots and stuff for 261
| Is 261 a square number? | 261 is NOT a square number |
| Is 261 a cube number? | 261 is NOT a cube number |
| Square root of the number 261 | 16.155494421404 |
| Cube root of the number 261 | 6.3906765283993 |
Recreational math for 261
| Number 261 reversed | 162 |
| Sum of the digits | 9 |
| No of digits | 3 |