Compare 1721 vs 1731
| Property | 1721 | 1731 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 17211 | 31 × 5771 |
| Prime factorization | 1721 | 3 × 577 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1721 | 1, 3, 577, 1731 |
| Number of properties | 6 | 1 |
| Additive primes | 143rd | |
| Chen primes | 169th | |
| Primes | 268th | |
| Pythagorean primes | 130th | |
| Semiprimes | 499th | |
| Twin primes (1st member) | 55th | |
| Ulam primes | 25th | |
| Roman numberals | MDCCXXI | MDCCXXXI |
| Base 2 | 110101110012 | 110110000112 |
| Base 3 | 21002023 | 21010103 |
| Base 4 | 1223214 | 1230034 |
| Base 5 | 233415 | 234115 |
| Base 6 | 115456 | 120036 |
| Base 7 | 50067 | 50227 |
| Base 8 | 32718 | 33038 |
| Base 9 | 23229 | 23339 |
| Base 10 | 172110 | 173110 |
| Base 11 | 132511 | 133411 |
| Base 12 | bb512 | 100312 |
| Base 13 | a2513 | a3213 |
| Base 14 | 8ad14 | 8b914 |
| Base 15 | 79b15 | 7a615 |
| Base 16 | 6b916 | 6c316 |