Compare 307 vs 309
| Property | 307 | 309 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 3071 | 31 × 1031 |
| Prime factorization | 307 | 3 × 103 |
| Divisors count | 2 | 4 |
| Divisors | 1, 307 | 1, 3, 103, 309 |
| Number of properties | 9 | 1 |
| Chen primes | 47th | |
| Cousin primes (1st member) | 18th | |
| Good primes | 22nd | |
| Harmonic primes | 25th | |
| Isolated primes | 26th | |
| Lucky primes | 18th | |
| Primes | 63rd | |
| Prime triplets (1st member) | 18th | |
| Semiprimes | 99th | |
| Sexy primes (1st member) | 35th | |
| Roman numberals | CCCVII | CCCIX |
| Base 2 | 1001100112 | 1001101012 |
| Base 3 | 1021013 | 1021103 |
| Base 4 | 103034 | 103114 |
| Base 5 | 22125 | 22145 |
| Base 6 | 12316 | 12336 |
| Base 7 | 6167 | 6217 |
| Base 8 | 4638 | 4658 |
| Base 9 | 3719 | 3739 |
| Base 10 | 30710 | 30910 |
| Base 11 | 25a11 | 26111 |
| Base 12 | 21712 | 21912 |
| Base 13 | 1a813 | 1aa13 |
| Base 14 | 17d14 | 18114 |
| Base 15 | 15715 | 15915 |
| Base 16 | 13316 | 13516 |