261
Everything about the number 261 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 261
| Nominal | 261 |
| Cardinal | two hundred sixty-one |
| Ordinal | 261st |
| This number as US currency | two hundred sixty-one dollars |
Properties (and some facts) of 261
| 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 |
| Is 261 a triangle number? | 261 is not a triangle number |
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261 in other bases
| Base 2 (Binary) | 100000101 |
| Base 3 (Ternary) | 100200 |
| Base 4 (Quaternary) | 10011 |
| Base 5 (Quinary) | 2021 |
| Base 6 (Senary) | 1113 |
| Base 8 (Octal) | 405 |
| Base 12 (Duodecimal) | 199 |
| Base 16 (Hexadecimal) | 105 |
| Base 20 (Vigesimal) | D1 |
Primes and factors tests for 261
| Is 261 a prime number? | 261 is not a prime number |
| 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 |
261 in other numeral systems
| 261 in Roman numerals | CCLXI |
| 261 in Chinese numerals | 貳佰陸拾壹 |
| 261 in Babylonian numerals |   |
| 261 in Egyptian numerals | 𓍣𓎋𓏺 |
Roots and squares 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 261 | 16.155494421404 |
| Cube root of 261 | 6.3906765283993 |
Recreational math for 261
| Number 261 reversed | 162 |
| Sum of the digits | 9 |
| Number of digits | 3 |
Arithmetic tables for 261
Other pages about 261
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