Compare 149 vs 161
| Property | 149 | 161 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 1491 | 71 × 231 |
| Prime factorization | 149 | 7 × 23 |
| Divisors count | 2 | 4 |
| Divisors | 1, 149 | 1, 7, 23, 161 |
| Number of properties | 8 | 1 |
| Chen primes | 29th | |
| Emirps | 11th | |
| Good primes | 14th | |
| Harmonic primes | 12th | |
| Long primes | 13th | |
| Primes | 35th | |
| Pythagorean primes | 16th | |
| Semiprimes | 54th | |
| Twin primes (1st member) | 12th | |
| Roman numberals | CXLIX | CLXI |
| Base 2 | 100101012 | 101000012 |
| Base 3 | 121123 | 122223 |
| Base 4 | 21114 | 22014 |
| Base 5 | 10445 | 11215 |
| Base 6 | 4056 | 4256 |
| Base 7 | 3027 | 3207 |
| Base 8 | 2258 | 2418 |
| Base 9 | 1759 | 1889 |
| Base 10 | 14910 | 16110 |
| Base 11 | 12611 | 13711 |
| Base 12 | 10512 | 11512 |
| Base 13 | b613 | c513 |
| Base 14 | a914 | b714 |
| Base 15 | 9e15 | ab15 |
| Base 16 | 9516 | a116 |