Compare 61 vs 65
| Property | 61 | 65 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 611 | 51 × 131 |
| Prime factorization | 61 | 5 × 13 |
| Divisors count | 2 | 4 |
| Divisors | 1, 61 | 1, 5, 13, 65 |
| Number of properties | 12 | 1 |
| Additive primes | 11th | |
| Centered decagonal primes | 3rd | |
| Centered square primes | 4th | |
| Cuban primes 1 | 4th | |
| Long primes | 8th | |
| Primes | 18th | |
| Pythagorean primes | 8th | |
| Semiprimes | 23rd | |
| Sexy primes (1st member) | 12th | |
| Sexy prime quadrupletss (1st member) | 4th | |
| Sexy prime triplets (1st member) | 8th | |
| Solinas primes | 15th | |
| Twin primes (2nd member) | 7th | |
| Roman numberals | LXI | LXV |
| Base 2 | 1111012 | 10000012 |
| Base 3 | 20213 | 21023 |
| Base 4 | 3314 | 10014 |
| Base 5 | 2215 | 2305 |
| Base 6 | 1416 | 1456 |
| Base 7 | 1157 | 1227 |
| Base 8 | 758 | 1018 |
| Base 9 | 679 | 729 |
| Base 10 | 6110 | 6510 |
| Base 11 | 5611 | 5a11 |
| Base 12 | 5112 | 5512 |
| Base 13 | 4913 | 5013 |
| Base 14 | 4514 | 4914 |
| Base 15 | 4115 | 4515 |
| Base 16 | 3d16 | 4116 |