Names of 7991
| Nominal | 7991 |
| Cardinal | seven thousand nine hundred ninety-one |
| Ordinal | 7,991st |
| This number as US currency | seven thousand nine hundred ninety-one dollars |
| Is 7991 an odd number? | 7991 is an odd number |
| Is 7991 an even number? | 7991 is NOT an even number |
| Is 7991 a palindrome? | 7991 is NOT a palindrome number |
| Is 7991 a triangle number? | 7991 is NOT a triangle number |
7991 in other Bases
| Base 2 (Binary) | 11111001101112 |
| Base 3 (Ternary) | 1012212223 |
| Base 4 (Quaternary) | 13303134 |
| Base 5 (Quinary) | 2234315 |
| Base 6 (Senary) | 1005556 |
| Base 8 (Octal) | 174678 |
| Base 12 (Duodecimal) | 475B12 |
| Base 16 (Hexadecimal) | 1F3716 |
| Base 20 (Vigesimal) | JJB20 |
Primes and Factors tests for 7991
| Is 7991 a Prime Number? | 7991 is NOT a prime |
| Is 7991 a perfect number? | 7991 is NOT a perfect number |
| Is 7991 a Mersenne Prime? | 7991 is NOT a Mersenne prime |
| Is 7991 a Fermat Prime? | 7991 is NOT a Fermat prime |
| Is 7991 a Fibonacci Prime? | 7991 is NOT a Fibonacci prime |
| Is 7991 a Partition Prime? | 7991 is NOT a Partition prime |
| Is 7991 a Pell Prime? | 7991 is NOT a Pell prime |
| Prime Factors | Prime factors of 7991 |
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7991 in other Numerals
| 7991 in Roman Numeral | VMMCMXCI |
| 7991 in Chinese Numeral | 柒仟玖佰玖拾壹 |
| 7991 in Egyptian Numeral | 𓇂𓍪𓎎𓏺 |
| 7991 in Babylonian Numeral |    |
Roots and stuff for 7991
| Is 7991 a square number? | 7991 is NOT a square number |
| Is 7991 a cube number? | 7991 is NOT a cube number |
| Square root of the number 7991 | 89.392393412415 |
| Cube root of the number 7991 | 19.992497185741 |
Recreational math for 7991
| Number 7991 reversed | 1997 |
| Sum of the digits | 26 |
| No of digits | 4 |