Names of 641
| Nominal | 641 |
| Cardinal | six hundred forty-one |
| Ordinal | 641st |
| This number as US currency | six hundred forty-one dollars |
| Is 641 an odd number? | 641 is an odd number |
| Is 641 an even number? | 641 is NOT an even number |
| Is 641 a palindrome? | 641 is NOT a palindrome number |
| Is 641 a triangle number? | 641 is NOT a triangle number |
641 in other Bases
| Base 2 (Binary) | 10100000012 |
| Base 3 (Ternary) | 2122023 |
| Base 4 (Quaternary) | 220014 |
| Base 5 (Quinary) | 100315 |
| Base 6 (Senary) | 25456 |
| Base 8 (Octal) | 12018 |
| Base 12 (Duodecimal) | 45512 |
| Base 16 (Hexadecimal) | 28116 |
| Base 20 (Vigesimal) | 1C120 |
Primes and Factors tests for 641
| Is 641 a Prime Number? | 641 is a prime |
| Is 641 a perfect number? | 641 is NOT a perfect number |
| Is 641 a Mersenne Prime? | 641 is NOT a Mersenne prime |
| Is 641 a Fermat Prime? | 641 is NOT a Fermat prime |
| Is 641 a Fibonacci Prime? | 641 is NOT a Fibonacci prime |
| Is 641 a Partition Prime? | 641 is NOT a Partition prime |
| Is 641 a Pell Prime? | 641 is NOT a Pell prime |
| Prime Factors | Prime factors of 641 |
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641 in other Numerals
| 641 in Roman Numeral | DCXLI |
| 641 in Chinese Numeral | 陸佰肆拾壹 |
| 641 in Egyptian Numeral | 𓍧𓎉𓏺 |
| 641 in Babylonian Numeral |   |
Roots and stuff for 641
| Is 641 a square number? | 641 is NOT a square number |
| Is 641 a cube number? | 641 is NOT a cube number |
| Square root of the number 641 | 25.317977802344 |
| Cube root of the number 641 | 8.6222248300477 |
Recreational math for 641
| Number 641 reversed | 146 |
| Sum of the digits | 11 |
| No of digits | 3 |