Compare 389 vs 391
| Property | 389 | 391 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 3891 | 171 × 231 |
| Prime factorization | 389 | 17 × 23 |
| Divisors count | 2 | 4 |
| Divisors | 1, 389 | 1, 17, 23, 391 |
| Number of properties | 7 | 1 |
| Chen primes | 55th | |
| Emirps | 20th | |
| Isolated primes | 36th | |
| Long primes | 29th | |
| Primes | 77th | |
| Pythagorean primes | 36th | |
| Semiprimes | 122nd | |
| Sexy primes (2nd member) | 42nd | |
| Roman numberals | CCCLXXXIX | CCCXCI |
| Base 2 | 1100001012 | 1100001112 |
| Base 3 | 1121023 | 1121113 |
| Base 4 | 120114 | 120134 |
| Base 5 | 30245 | 30315 |
| Base 6 | 14456 | 14516 |
| Base 7 | 10647 | 10667 |
| Base 8 | 6058 | 6078 |
| Base 9 | 4729 | 4749 |
| Base 10 | 38910 | 39110 |
| Base 11 | 32411 | 32611 |
| Base 12 | 28512 | 28712 |
| Base 13 | 23c13 | 24113 |
| Base 14 | 1db14 | 1dd14 |
| Base 15 | 1ae15 | 1b115 |
| Base 16 | 18516 | 18716 |