Compare 142 vs 149
| Property | 142 | 149 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 21 × 711 | 1491 |
| Prime factorization | 2 × 71 | 149 |
| Divisors count | 4 | 2 |
| Divisors | 1, 2, 71, 142 | 1, 149 |
| Number of properties | 1 | 8 |
| Chen primes | 29th | |
| Emirps | 11th | |
| Good primes | 14th | |
| Harmonic primes | 12th | |
| Long primes | 13th | |
| Primes | 35th | |
| Pythagorean primes | 16th | |
| Semiprimes | 47th | |
| Twin primes (1st member) | 12th | |
| Roman numberals | CXLII | CXLIX |
| Base 2 | 100011102 | 100101012 |
| Base 3 | 120213 | 121123 |
| Base 4 | 20324 | 21114 |
| Base 5 | 10325 | 10445 |
| Base 6 | 3546 | 4056 |
| Base 7 | 2627 | 3027 |
| Base 8 | 2168 | 2258 |
| Base 9 | 1679 | 1759 |
| Base 10 | 14210 | 14910 |
| Base 11 | 11a11 | 12611 |
| Base 12 | ba12 | 10512 |
| Base 13 | ac13 | b613 |
| Base 14 | a214 | a914 |
| Base 15 | 9715 | 9e15 |
| Base 16 | 8e16 | 9516 |