Names of 3991
| Nominal | 3991 |
| Cardinal | three thousand nine hundred ninety-one |
| Ordinal | 3,991st |
| This number as US currency | three thousand nine hundred ninety-one dollars |
| Is 3991 an odd number? | 3991 is an odd number |
| Is 3991 an even number? | 3991 is NOT an even number |
| Is 3991 a palindrome? | 3991 is NOT a palindrome number |
| Is 3991 a triangle number? | 3991 is NOT a triangle number |
3991 in other Bases
| Base 2 (Binary) | 1111100101112 |
| Base 3 (Ternary) | 121102113 |
| Base 4 (Quaternary) | 3321134 |
| Base 5 (Quinary) | 1114315 |
| Base 6 (Senary) | 302516 |
| Base 8 (Octal) | 76278 |
| Base 12 (Duodecimal) | 238712 |
| Base 16 (Hexadecimal) | F9716 |
| Base 20 (Vigesimal) | 9JB20 |
Primes and Factors tests for 3991
| Is 3991 a Prime Number? | 3991 is NOT a prime |
| Is 3991 a perfect number? | 3991 is NOT a perfect number |
| Is 3991 a Mersenne Prime? | 3991 is NOT a Mersenne prime |
| Is 3991 a Fermat Prime? | 3991 is NOT a Fermat prime |
| Is 3991 a Fibonacci Prime? | 3991 is NOT a Fibonacci prime |
| Is 3991 a Partition Prime? | 3991 is NOT a Partition prime |
| Is 3991 a Pell Prime? | 3991 is NOT a Pell prime |
| Prime Factors | Prime factors of 3991 |
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3991 in other Numerals
| 3991 in Roman Numeral | MMMCMXCI |
| 3991 in Chinese Numeral | 叄仟玖佰玖拾壹 |
| 3991 in Egyptian Numeral | 𓆾𓍪𓎎𓏺 |
| 3991 in Babylonian Numeral |    |
Roots and stuff for 3991
| Is 3991 a square number? | 3991 is NOT a square number |
| Is 3991 a cube number? | 3991 is NOT a cube number |
| Square root of the number 3991 | 63.174361888348 |
| Cube root of the number 3991 | 15.862096071483 |
Recreational math for 3991
| Number 3991 reversed | 1993 |
| Sum of the digits | 22 |
| No of digits | 4 |