Compare 811 vs 815
| Property | 811 | 815 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 8111 | 51 × 1631 |
| Prime factorization | 811 | 5 × 163 |
| Divisors count | 2 | 4 |
| Divisors | 1, 811 | 1, 5, 163, 815 |
| Number of properties | 4 | 1 |
| Chen primes | 96th | |
| Long primes | 49th | |
| Primes | 141st | |
| Semiprimes | 247th | |
| Twin primes (2nd member) | 31st | |
| Roman numberals | DCCCXI | DCCCXV |
| Base 2 | 11001010112 | 11001011112 |
| Base 3 | 10100013 | 10100123 |
| Base 4 | 302234 | 302334 |
| Base 5 | 112215 | 112305 |
| Base 6 | 34316 | 34356 |
| Base 7 | 22367 | 22437 |
| Base 8 | 14538 | 14578 |
| Base 9 | 11019 | 11059 |
| Base 10 | 81110 | 81510 |
| Base 11 | 67811 | 68111 |
| Base 12 | 57712 | 57b12 |
| Base 13 | 4a513 | 4a913 |
| Base 14 | 41d14 | 42314 |
| Base 15 | 39115 | 39515 |
| Base 16 | 32b16 | 32f16 |