Names of 2991
| Nominal | 2991 |
| Cardinal | two thousand nine hundred ninety-one |
| Ordinal | 2,991st |
| This number as US currency | two thousand nine hundred ninety-one dollars |
| Is 2991 an odd number? | 2991 is an odd number |
| Is 2991 an even number? | 2991 is NOT an even number |
| Is 2991 a palindrome? | 2991 is NOT a palindrome number |
| Is 2991 a triangle number? | 2991 is NOT a triangle number |
2991 in other Bases
| Base 2 (Binary) | 1011101011112 |
| Base 3 (Ternary) | 110022103 |
| Base 4 (Quaternary) | 2322334 |
| Base 5 (Quinary) | 434315 |
| Base 6 (Senary) | 215036 |
| Base 8 (Octal) | 56578 |
| Base 12 (Duodecimal) | 189312 |
| Base 16 (Hexadecimal) | BAF16 |
| Base 20 (Vigesimal) | 79B20 |
Primes and Factors tests for 2991
| Is 2991 a Prime Number? | 2991 is NOT a prime |
| Is 2991 a perfect number? | 2991 is NOT a perfect number |
| Is 2991 a Mersenne Prime? | 2991 is NOT a Mersenne prime |
| Is 2991 a Fermat Prime? | 2991 is NOT a Fermat prime |
| Is 2991 a Fibonacci Prime? | 2991 is NOT a Fibonacci prime |
| Is 2991 a Partition Prime? | 2991 is NOT a Partition prime |
| Is 2991 a Pell Prime? | 2991 is NOT a Pell prime |
| Prime Factors | Prime factors of 2991 |
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2991 in other Numerals
| 2991 in Roman Numeral | MMCMXCI |
| 2991 in Chinese Numeral | 貳仟玖佰玖拾壹 |
| 2991 in Egyptian Numeral | 𓆽𓍪𓎎𓏺 |
| 2991 in Babylonian Numeral |   |
Roots and stuff for 2991
| Is 2991 a square number? | 2991 is NOT a square number |
| Is 2991 a cube number? | 2991 is NOT a cube number |
| Square root of the number 2991 | 54.690035655501 |
| Cube root of the number 2991 | 14.40805876079 |
Recreational math for 2991
| Number 2991 reversed | 1992 |
| Sum of the digits | 21 |
| No of digits | 4 |