Names of 643
| Nominal | 643 |
| Cardinal | six hundred forty-three |
| Ordinal | 643rd |
| This number as US currency | six hundred forty-three dollars |
| Is 643 an odd number? | 643 is an odd number |
| Is 643 an even number? | 643 is NOT an even number |
| Is 643 a palindrome? | 643 is NOT a palindrome number |
| Is 643 a triangle number? | 643 is NOT a triangle number |
643 in other Bases
| Base 2 (Binary) | 10100000112 |
| Base 3 (Ternary) | 2122113 |
| Base 4 (Quaternary) | 220034 |
| Base 5 (Quinary) | 100335 |
| Base 6 (Senary) | 25516 |
| Base 8 (Octal) | 12038 |
| Base 12 (Duodecimal) | 45712 |
| Base 16 (Hexadecimal) | 28316 |
| Base 20 (Vigesimal) | 1C320 |
Primes and Factors tests for 643
| Is 643 a Prime Number? | 643 is a prime |
| Is 643 a perfect number? | 643 is NOT a perfect number |
| Is 643 a Mersenne Prime? | 643 is NOT a Mersenne prime |
| Is 643 a Fermat Prime? | 643 is NOT a Fermat prime |
| Is 643 a Fibonacci Prime? | 643 is NOT a Fibonacci prime |
| Is 643 a Partition Prime? | 643 is NOT a Partition prime |
| Is 643 a Pell Prime? | 643 is NOT a Pell prime |
| Prime Factors | Prime factors of 643 |
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643 in other Numerals
| 643 in Roman Numeral | DCXLIII |
| 643 in Chinese Numeral | 陸佰肆拾叄 |
| 643 in Egyptian Numeral | 𓍧𓎉𓏼 |
| 643 in Babylonian Numeral |   |
Roots and stuff for 643
| Is 643 a square number? | 643 is NOT a square number |
| Is 643 a cube number? | 643 is NOT a cube number |
| Square root of the number 643 | 25.357444666212 |
| Cube root of the number 643 | 8.6311829921584 |
Recreational math for 643
| Number 643 reversed | 346 |
| Sum of the digits | 13 |
| No of digits | 3 |