Compare 815 vs 823
| Property | 815 | 823 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 1631 | 8231 |
| Prime factorization | 5 × 163 | 823 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 163, 815 | 1, 823 |
| Number of properties | 1 | 11 |
| Additive primes | 76th | |
| Cousin primes (1st member) | 34th | |
| Left-truncatable primes | 46th | |
| Long primes | 51st | |
| Lucky primes | 39th | |
| Primes | 143rd | |
| Prime quadruplets (2nd member) | 5th | |
| Prime triplets (1st member) | 26th | |
| Prime triplets (2nd member) | 25th | |
| Semiprimes | 247th | |
| Sexy primes (1st member) | 65th | |
| Twin primes (2nd member) | 32nd | |
| Roman numberals | DCCCXV | DCCCXXIII |
| Base 2 | 11001011112 | 11001101112 |
| Base 3 | 10100123 | 10101113 |
| Base 4 | 302334 | 303134 |
| Base 5 | 112305 | 112435 |
| Base 6 | 34356 | 34516 |
| Base 7 | 22437 | 22547 |
| Base 8 | 14578 | 14678 |
| Base 9 | 11059 | 11149 |
| Base 10 | 81510 | 82310 |
| Base 11 | 68111 | 68911 |
| Base 12 | 57b12 | 58712 |
| Base 13 | 4a913 | 4b413 |
| Base 14 | 42314 | 42b14 |
| Base 15 | 39515 | 39d15 |
| Base 16 | 32f16 | 33716 |