61
Everything about the number 61 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 61
| Nominal | 61 |
| Cardinal | sixty-one |
| Ordinal | 61st |
| This number as US currency | sixty-one dollars |
Properties (and some facts) of 61
| Is 61 an odd number? | 61 is an odd number |
| Is 61 an even number? | 61 is not an even number |
| Is 61 a palindrome? | 61 is not a palindrome |
| Is 61 a triangle number? | 61 is not a triangle number |
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61 in other bases
| Base 2 (Binary) | 111101 |
| Base 3 (Ternary) | 2021 |
| Base 4 (Quaternary) | 331 |
| Base 5 (Quinary) | 221 |
| Base 6 (Senary) | 141 |
| Base 8 (Octal) | 75 |
| Base 12 (Duodecimal) | 51 |
| Base 16 (Hexadecimal) | 3D |
| Base 20 (Vigesimal) | 31 |
Primes and factors tests for 61
| Is 61 a prime number? | 61 is a prime number |
| Is 61 a perfect number? | 61 is not a perfect number |
| Is 61 a Mersenne prime? | 61 is not a Mersenne prime |
| Is 61 a Fermat prime? | 61 is not a Fermat prime |
| Is 61 a Fibonacci prime? | 61 is not a Fibonacci prime |
| Is 61 a partition prime? | 61 is not a partition prime |
| Is 61 a Pell prime? | 61 is not a Pell prime |
| Prime Factors | Prime factors of 61 |
61 in other numeral systems
| 61 in Roman numerals | LXI |
| 61 in Chinese numerals | 陸拾壹 |
| 61 in Babylonian numerals |  |
| 61 in Egyptian numerals | 𓎋𓏺 |
Roots and squares for 61
| Is 61 a square number? | 61 is not a square number |
| Is 61 a cube number? | 61 is not a cube number |
| Square root of 61 | 7.8102496759067 |
| Cube root of 61 | 3.9364971831022 |
Recreational math for 61
| Number 61 reversed | 16 |
| Sum of the digits | 7 |
| Number of digits | 2 |
Arithmetic tables for 61
Other pages about 61
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