Names of 4991
| Nominal | 4991 |
| Cardinal | four thousand nine hundred ninety-one |
| Ordinal | 4,991st |
| This number as US currency | four thousand nine hundred ninety-one dollars |
| Is 4991 an odd number? | 4991 is an odd number |
| Is 4991 an even number? | 4991 is NOT an even number |
| Is 4991 a palindrome? | 4991 is NOT a palindrome number |
| Is 4991 a triangle number? | 4991 is NOT a triangle number |
4991 in other Bases
| Base 2 (Binary) | 10011011111112 |
| Base 3 (Ternary) | 202112123 |
| Base 4 (Quaternary) | 10313334 |
| Base 5 (Quinary) | 1244315 |
| Base 6 (Senary) | 350356 |
| Base 8 (Octal) | 115778 |
| Base 12 (Duodecimal) | 2A7B12 |
| Base 16 (Hexadecimal) | 137F16 |
| Base 20 (Vigesimal) | C9B20 |
Primes and Factors tests for 4991
| Is 4991 a Prime Number? | 4991 is NOT a prime |
| Is 4991 a perfect number? | 4991 is NOT a perfect number |
| Is 4991 a Mersenne Prime? | 4991 is NOT a Mersenne prime |
| Is 4991 a Fermat Prime? | 4991 is NOT a Fermat prime |
| Is 4991 a Fibonacci Prime? | 4991 is NOT a Fibonacci prime |
| Is 4991 a Partition Prime? | 4991 is NOT a Partition prime |
| Is 4991 a Pell Prime? | 4991 is NOT a Pell prime |
| Prime Factors | Prime factors of 4991 |
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4991 in other Numerals
| 4991 in Roman Numeral | MVCMXCI |
| 4991 in Chinese Numeral | 肆仟玖佰玖拾壹 |
| 4991 in Egyptian Numeral | 𓆿𓍪𓎎𓏺 |
| 4991 in Babylonian Numeral |    |
Roots and stuff for 4991
| Is 4991 a square number? | 4991 is NOT a square number |
| Is 4991 a cube number? | 4991 is NOT a cube number |
| Square root of the number 4991 | 70.64700984472 |
| Cube root of the number 4991 | 17.08949344901 |
Recreational math for 4991
| Number 4991 reversed | 1994 |
| Sum of the digits | 23 |
| No of digits | 4 |