Compare 515 vs 523
| Property | 515 | 523 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 51 × 1031 | 5231 |
| Prime factorization | 5 × 103 | 523 |
| Divisors count | 4 | 2 |
| Divisors | 1, 5, 103, 515 | 1, 523 |
| Number of properties | 1 | 3 |
| Left-truncatable primes | 34th | |
| Primes | 99th | |
| Semiprimes | 159th | |
| Twin primes (2nd member) | 25th | |
| Roman numberals | DXV | DXXIII |
| Base 2 | 10000000112 | 10000010112 |
| Base 3 | 2010023 | 2011013 |
| Base 4 | 200034 | 200234 |
| Base 5 | 40305 | 40435 |
| Base 6 | 22156 | 22316 |
| Base 7 | 13347 | 13457 |
| Base 8 | 10038 | 10138 |
| Base 9 | 6329 | 6419 |
| Base 10 | 51510 | 52310 |
| Base 11 | 42911 | 43611 |
| Base 12 | 36b12 | 37712 |
| Base 13 | 30813 | 31313 |
| Base 14 | 28b14 | 29514 |
| Base 15 | 24515 | 24d15 |
| Base 16 | 20316 | 20b16 |