Names of 61991
| Nominal | 61991 |
| Cardinal | sixty-one thousand nine hundred ninety-one |
| Ordinal | 61,991st |
| This number as US currency | sixty-one thousand nine hundred ninety-one dollars |
| Is 61991 an odd number? | 61991 is an odd number |
| Is 61991 an even number? | 61991 is NOT an even number |
| Is 61991 a palindrome? | 61991 is NOT a palindrome number |
| Is 61991 a triangle number? | 61991 is NOT a triangle number |
61991 in other Bases
| Base 2 (Binary) | 11110010001001112 |
| Base 3 (Ternary) | 100110002223 |
| Base 4 (Quaternary) | 330202134 |
| Base 5 (Quinary) | 34404315 |
| Base 6 (Senary) | 11545556 |
| Base 8 (Octal) | 1710478 |
| Base 12 (Duodecimal) | 2BA5B12 |
| Base 16 (Hexadecimal) | F22716 |
| Base 20 (Vigesimal) | 7EJB20 |
Primes and Factors tests for 61991
| Is 61991 a Prime Number? | 61991 is a prime |
| Is 61991 a perfect number? | 61991 is NOT a perfect number |
| Is 61991 a Mersenne Prime? | 61991 is NOT a Mersenne prime |
| Is 61991 a Fermat Prime? | 61991 is NOT a Fermat prime |
| Is 61991 a Fibonacci Prime? | 61991 is NOT a Fibonacci prime |
| Is 61991 a Partition Prime? | 61991 is NOT a Partition prime |
| Is 61991 a Pell Prime? | 61991 is NOT a Pell prime |
| Prime Factors | Prime factors of 61991 |
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61991 in other Numerals
| 61991 in Roman Numeral | LXMCMXCI |
| 61991 in Chinese Numeral | 陸萬壹仟玖佰玖拾壹 |
| 61991 in Egyptian Numeral | 𓂲𓆼𓍪𓎎𓏺 |
| 61991 in Babylonian Numeral |    |
Roots and stuff for 61991
| Is 61991 a square number? | 61991 is NOT a square number |
| Is 61991 a cube number? | 61991 is NOT a cube number |
| Square root of the number 61991 | 248.97991886897 |
| Cube root of the number 61991 | 39.577000895287 |
Recreational math for 61991
| Number 61991 reversed | 19916 |
| Sum of the digits | 26 |
| No of digits | 5 |