Compare 391 vs 393
| Property | 391 | 393 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 171 × 231 | 31 × 1311 |
| Prime factorization | 17 × 23 | 3 × 131 |
| Divisors count | 4 | 4 |
| Divisors | 1, 17, 23, 391 | 1, 3, 131, 393 |
| Number of properties | 1 | 1 |
| Semiprimes | 122nd | 123rd |
| Roman numberals | CCCXCI | CCCXCIII |
| Base 2 | 1100001112 | 1100010012 |
| Base 3 | 1121113 | 1121203 |
| Base 4 | 120134 | 120214 |
| Base 5 | 30315 | 30335 |
| Base 6 | 14516 | 14536 |
| Base 7 | 10667 | 11017 |
| Base 8 | 6078 | 6118 |
| Base 9 | 4749 | 4769 |
| Base 10 | 39110 | 39310 |
| Base 11 | 32611 | 32811 |
| Base 12 | 28712 | 28912 |
| Base 13 | 24113 | 24313 |
| Base 14 | 1dd14 | 20114 |
| Base 15 | 1b115 | 1b315 |
| Base 16 | 18716 | 18916 |