Names of 813
| Nominal | 813 |
| Cardinal | eight hundred thirteen |
| Ordinal | 813th |
| This number as US currency | eight hundred thirteen dollars |
| Is 813 an odd number? | 813 is an odd number |
| Is 813 an even number? | 813 is NOT an even number |
| Is 813 a palindrome? | 813 is NOT a palindrome number |
| Is 813 a triangle number? | 813 is NOT a triangle number |
813 in other Bases
| Base 2 (Binary) | 11001011012 |
| Base 3 (Ternary) | 10100103 |
| Base 4 (Quaternary) | 302314 |
| Base 5 (Quinary) | 112235 |
| Base 6 (Senary) | 34336 |
| Base 8 (Octal) | 14558 |
| Base 12 (Duodecimal) | 57912 |
| Base 16 (Hexadecimal) | 32D16 |
| Base 20 (Vigesimal) | 20D20 |
Primes and Factors tests for 813
| Is 813 a Prime Number? | 813 is NOT a prime |
| Is 813 a perfect number? | 813 is NOT a perfect number |
| Is 813 a Mersenne Prime? | 813 is NOT a Mersenne prime |
| Is 813 a Fermat Prime? | 813 is NOT a Fermat prime |
| Is 813 a Fibonacci Prime? | 813 is NOT a Fibonacci prime |
| Is 813 a Partition Prime? | 813 is NOT a Partition prime |
| Is 813 a Pell Prime? | 813 is NOT a Pell prime |
| Prime Factors | Prime factors of 813 |
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813 in other Numerals
| 813 in Roman Numeral | DCCCXIII |
| 813 in Chinese Numeral | 捌佰壹拾叄 |
| 813 in Egyptian Numeral | 𓍩𓎆𓏼 |
| 813 in Babylonian Numeral |   |
Roots and stuff for 813
| Is 813 a square number? | 813 is NOT a square number |
| Is 813 a cube number? | 813 is NOT a cube number |
| Square root of the number 813 | 28.513154858767 |
| Cube root of the number 813 | 9.3331916078252 |
Recreational math for 813
| Number 813 reversed | 318 |
| Sum of the digits | 12 |
| No of digits | 3 |