Compare 121 vs 127
| Property | 121 | 127 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 1 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 112 | 1271 |
| Prime factorization | 11 × 11 | 127 |
| Divisors count | 3 | 2 |
| Divisors | 1, 11, 121 | 1, 127 |
| Number of properties | 1 | 13 |
| Chen primes | 25th | |
| Class 1+ primes | 13th | |
| Cousin primes (1st member) | 12th | |
| Cuban primes 1 | 5th | |
| Double mersenne primes | 2nd | |
| Good primes | 13th | |
| Isolated primes | 12th | |
| Lucky primes | 10th | |
| Mersenne primes | 4th | |
| Pierpont primes of the 2nd kind | 13th | |
| Primes | 31st | |
| Semiprimes | 40th | |
| Solinas primes | 22nd | |
| Super primes | 11th | |
| Roman numberals | CXXI | CXXVII |
| Base 2 | 11110012 | 11111112 |
| Base 3 | 111113 | 112013 |
| Base 4 | 13214 | 13334 |
| Base 5 | 4415 | 10025 |
| Base 6 | 3216 | 3316 |
| Base 7 | 2327 | 2417 |
| Base 8 | 1718 | 1778 |
| Base 9 | 1449 | 1519 |
| Base 10 | 12110 | 12710 |
| Base 11 | 10011 | 10611 |
| Base 12 | a112 | a712 |
| Base 13 | 9413 | 9a13 |
| Base 14 | 8914 | 9114 |
| Base 15 | 8115 | 8715 |
| Base 16 | 7916 | 7f16 |