Compare 139 vs 142
| Property | 139 | 142 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 1391 | 21 × 711 |
| Prime factorization | 139 | 2 × 71 |
| Divisors count | 2 | 4 |
| Divisors | 1, 139 | 1, 2, 71, 142 |
| Number of properties | 6 | 1 |
| Additive primes | 19th | |
| Chen primes | 28th | |
| Happy primes | 10th | |
| Harmonic primes | 11th | |
| Primes | 34th | |
| Semiprimes | 47th | |
| Twin primes (2nd member) | 11th | |
| Roman numberals | CXXXIX | CXLII |
| Base 2 | 100010112 | 100011102 |
| Base 3 | 120113 | 120213 |
| Base 4 | 20234 | 20324 |
| Base 5 | 10245 | 10325 |
| Base 6 | 3516 | 3546 |
| Base 7 | 2567 | 2627 |
| Base 8 | 2138 | 2168 |
| Base 9 | 1649 | 1679 |
| Base 10 | 13910 | 14210 |
| Base 11 | 11711 | 11a11 |
| Base 12 | b712 | ba12 |
| Base 13 | a913 | ac13 |
| Base 14 | 9d14 | a214 |
| Base 15 | 9415 | 9715 |
| Base 16 | 8b16 | 8e16 |