Compare 811 vs 813
| Property | 811 | 813 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 8111 | 31 × 2711 |
| Prime factorization | 811 | 3 × 271 |
| Divisors count | 2 | 4 |
| Divisors | 1, 811 | 1, 3, 271, 813 |
| Number of properties | 4 | 1 |
| Chen primes | 96th | |
| Long primes | 49th | |
| Primes | 141st | |
| Semiprimes | 246th | |
| Twin primes (2nd member) | 31st | |
| Roman numberals | DCCCXI | DCCCXIII |
| Base 2 | 11001010112 | 11001011012 |
| Base 3 | 10100013 | 10100103 |
| Base 4 | 302234 | 302314 |
| Base 5 | 112215 | 112235 |
| Base 6 | 34316 | 34336 |
| Base 7 | 22367 | 22417 |
| Base 8 | 14538 | 14558 |
| Base 9 | 11019 | 11039 |
| Base 10 | 81110 | 81310 |
| Base 11 | 67811 | 67a11 |
| Base 12 | 57712 | 57912 |
| Base 13 | 4a513 | 4a713 |
| Base 14 | 41d14 | 42114 |
| Base 15 | 39115 | 39315 |
| Base 16 | 32b16 | 32d16 |