Compare 1721 vs 1729
| Property | 1721 | 1729 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 17211 | 71 × 131 × 191 |
| Prime factorization | 1721 | 7 × 13 × 19 |
| Divisors count | 2 | 8 |
| Divisors | 1, 1721 | 1, 7, 13, 19, 91, 133, 247, 1729 |
| Number of properties | 6 | 0 |
| Additive primes | 143rd | |
| Chen primes | 169th | |
| Primes | 268th | |
| Pythagorean primes | 130th | |
| Twin primes (1st member) | 55th | |
| Ulam primes | 25th | |
| Roman numberals | MDCCXXI | MDCCXXIX |
| Base 2 | 110101110012 | 110110000012 |
| Base 3 | 21002023 | 21010013 |
| Base 4 | 1223214 | 1230014 |
| Base 5 | 233415 | 234045 |
| Base 6 | 115456 | 120016 |
| Base 7 | 50067 | 50207 |
| Base 8 | 32718 | 33018 |
| Base 9 | 23229 | 23319 |
| Base 10 | 172110 | 172910 |
| Base 11 | 132511 | 133211 |
| Base 12 | bb512 | 100112 |
| Base 13 | a2513 | a3013 |
| Base 14 | 8ad14 | 8b714 |
| Base 15 | 79b15 | 7a415 |
| Base 16 | 6b916 | 6c116 |