Compare 1721 vs 1871
| Property | 1721 | 1871 | 
|---|---|---|
| Type | prime | prime | 
| Unique factors | 1 | 1 | 
| Total factors | 1 | 1 | 
| Prime factorization | 17211 | 18711 | 
| Prime factorization | 1721 | 1871 | 
| Divisors count | 2 | 2 | 
| Divisors | 1, 1721 | 1, 1871 | 
| Number of properties | 6 | 11 | 
| Additive primes | 143rd | 151st | 
| Chen primes | 169th | 176th | 
| Cousin primes (2nd member) | 62nd | |
| Good primes | 60th | |
| Primes | 268th | 286th | 
| Prime quadruplets (1st member) | 7th | |
| Prime quintuplet 1s (2nd member) | 3rd | |
| Prime triplets (1st member) | 47th | |
| Prime triplets (2nd member) | 46th | |
| Pythagorean primes | 130th | |
| Sexy primes (1st member) | 122nd | |
| Twin primes (1st member) | 55th | 57th | 
| Ulam primes | 25th | |
| Roman numberals | MDCCXXI | MDCCCLXXI | 
| Base 2 | 110101110012 | 111010011112 | 
| Base 3 | 21002023 | 21200223 | 
| Base 4 | 1223214 | 1310334 | 
| Base 5 | 233415 | 244415 | 
| Base 6 | 115456 | 123556 | 
| Base 7 | 50067 | 53127 | 
| Base 8 | 32718 | 35178 | 
| Base 9 | 23229 | 25089 | 
| Base 10 | 172110 | 187110 | 
| Base 11 | 132511 | 145111 | 
| Base 12 | bb512 | 10bb12 | 
| Base 13 | a2513 | b0c13 | 
| Base 14 | 8ad14 | 97914 | 
| Base 15 | 79b15 | 84b15 | 
| Base 16 | 6b916 | 74f16 |