Compare 138 vs 149
| Property | 138 | 149 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 21 × 31 × 231 | 1491 |
| Prime factorization | 2 × 3 × 23 | 149 |
| Divisors count | 8 | 2 |
| Divisors | 1, 2, 3, 6, 23, 46, 69, 138 | 1, 149 |
| Number of properties | 0 | 8 |
| Chen primes | 29th | |
| Emirps | 11th | |
| Good primes | 14th | |
| Harmonic primes | 12th | |
| Long primes | 13th | |
| Primes | 35th | |
| Pythagorean primes | 16th | |
| Twin primes (1st member) | 12th | |
| Roman numberals | CXXXVIII | CXLIX |
| Base 2 | 100010102 | 100101012 |
| Base 3 | 120103 | 121123 |
| Base 4 | 20224 | 21114 |
| Base 5 | 10235 | 10445 |
| Base 6 | 3506 | 4056 |
| Base 7 | 2557 | 3027 |
| Base 8 | 2128 | 2258 |
| Base 9 | 1639 | 1759 |
| Base 10 | 13810 | 14910 |
| Base 11 | 11611 | 12611 |
| Base 12 | b612 | 10512 |
| Base 13 | a813 | b613 |
| Base 14 | 9c14 | a914 |
| Base 15 | 9315 | 9e15 |
| Base 16 | 8a16 | 9516 |