Compare 151 vs 161
| Property | 151 | 161 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 1511 | 71 × 231 |
| Prime factorization | 151 | 7 × 23 |
| Divisors count | 2 | 4 |
| Divisors | 1, 151 | 1, 7, 23, 161 |
| Number of properties | 9 | 1 |
| Additive primes | 20th | |
| Centered decagonal primes | 5th | |
| Lucky primes | 11th | |
| Multiplicative primes | 11th | |
| Palindromic primes | 8th | |
| Primes | 36th | |
| Semiprimes | 54th | |
| Sexy primes (1st member) | 21st | |
| Sexy prime triplets (1st member) | 12th | |
| Twin primes (2nd member) | 12th | |
| Roman numberals | CLI | CLXI |
| Base 2 | 100101112 | 101000012 |
| Base 3 | 121213 | 122223 |
| Base 4 | 21134 | 22014 |
| Base 5 | 11015 | 11215 |
| Base 6 | 4116 | 4256 |
| Base 7 | 3047 | 3207 |
| Base 8 | 2278 | 2418 |
| Base 9 | 1779 | 1889 |
| Base 10 | 15110 | 16110 |
| Base 11 | 12811 | 13711 |
| Base 12 | 10712 | 11512 |
| Base 13 | b813 | c513 |
| Base 14 | ab14 | b714 |
| Base 15 | a115 | ab15 |
| Base 16 | 9716 | a116 |