Compare 151 vs 155
| Property | 151 | 155 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 1511 | 51 × 311 |
| Prime factorization | 151 | 5 × 31 |
| Divisors count | 2 | 4 |
| Divisors | 1, 151 | 1, 5, 31, 155 |
| Number of properties | 9 | 1 |
| Additive primes | 20th | |
| Centered decagonal primes | 5th | |
| Lucky primes | 11th | |
| Multiplicative primes | 11th | |
| Palindromic primes | 8th | |
| Primes | 36th | |
| Semiprimes | 51st | |
| Sexy primes (1st member) | 21st | |
| Sexy prime triplets (1st member) | 12th | |
| Twin primes (2nd member) | 12th | |
| Roman numberals | CLI | CLV |
| Base 2 | 100101112 | 100110112 |
| Base 3 | 121213 | 122023 |
| Base 4 | 21134 | 21234 |
| Base 5 | 11015 | 11105 |
| Base 6 | 4116 | 4156 |
| Base 7 | 3047 | 3117 |
| Base 8 | 2278 | 2338 |
| Base 9 | 1779 | 1829 |
| Base 10 | 15110 | 15510 |
| Base 11 | 12811 | 13111 |
| Base 12 | 10712 | 10b12 |
| Base 13 | b813 | bc13 |
| Base 14 | ab14 | b114 |
| Base 15 | a115 | a515 |
| Base 16 | 9716 | 9b16 |