Names of 87991
| Nominal | 87991 |
| Cardinal | eighty-seven thousand nine hundred ninety-one |
| Ordinal | 87,991st |
| This number as US currency | eighty-seven thousand nine hundred ninety-one dollars |
| Is 87991 an odd number? | 87991 is an odd number |
| Is 87991 an even number? | 87991 is NOT an even number |
| Is 87991 a palindrome? | 87991 is NOT a palindrome number |
| Is 87991 a triangle number? | 87991 is NOT a triangle number |
87991 in other Bases
| Base 2 (Binary) | 101010111101101112 |
| Base 3 (Ternary) | 111102002213 |
| Base 4 (Quaternary) | 1111323134 |
| Base 5 (Quinary) | 103034315 |
| Base 6 (Senary) | 15152116 |
| Base 8 (Octal) | 2536678 |
| Base 12 (Duodecimal) | 42B0712 |
| Base 16 (Hexadecimal) | 157B716 |
| Base 20 (Vigesimal) | AJJB20 |
Primes and Factors tests for 87991
| Is 87991 a Prime Number? | 87991 is a prime |
| Is 87991 a perfect number? | 87991 is NOT a perfect number |
| Is 87991 a Mersenne Prime? | 87991 is NOT a Mersenne prime |
| Is 87991 a Fermat Prime? | 87991 is NOT a Fermat prime |
| Is 87991 a Fibonacci Prime? | 87991 is NOT a Fibonacci prime |
| Is 87991 a Partition Prime? | 87991 is NOT a Partition prime |
| Is 87991 a Pell Prime? | 87991 is NOT a Pell prime |
| Prime Factors | Prime factors of 87991 |
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87991 in other Numerals
| 87991 in Roman Numeral | LXXXVMMCMXCI |
| 87991 in Chinese Numeral | 捌萬柒仟玖佰玖拾壹 |
| 87991 in Egyptian Numeral | 𓂴𓇂𓍪𓎎𓏺 |
| 87991 in Babylonian Numeral |    |
Roots and stuff for 87991
| Is 87991 a square number? | 87991 is NOT a square number |
| Is 87991 a cube number? | 87991 is NOT a cube number |
| Square root of the number 87991 | 296.63276959904 |
| Cube root of the number 87991 | 44.478085409628 |
Recreational math for 87991
| Number 87991 reversed | 19978 |
| Sum of the digits | 34 |
| No of digits | 5 |