Compare 821 vs 971
| Property | 821 | 971 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 8211 | 9711 |
| Prime factorization | 821 | 971 |
| Divisors count | 2 | 2 |
| Divisors | 1, 821 | 1, 971 |
| Number of properties | 10 | 11 |
| Additive primes | 75th | 87th |
| Chen primes | 97th | 112th |
| Class 1+ primes | 19th | |
| Cousin primes (2nd member) | 41st | |
| Emirps | 34th | |
| Good primes | 40th | |
| Isolated primes | 95th | |
| Long primes | 50th | 58th |
| Pierpont primes of the 2nd kind | 19th | |
| Primes | 142nd | 164th |
| Prime quadruplets (1st member) | 5th | |
| Prime triplets (1st member) | 25th | |
| Pythagorean primes | 69th | |
| Sexy primes (1st member) | 64th | 72nd |
| Sexy prime triplets (1st member) | 28th | |
| Twin primes (1st member) | 32nd | |
| Roman numberals | DCCCXXI | CMLXXI |
| Base 2 | 11001101012 | 11110010112 |
| Base 3 | 10101023 | 10222223 |
| Base 4 | 303114 | 330234 |
| Base 5 | 112415 | 123415 |
| Base 6 | 34456 | 42556 |
| Base 7 | 22527 | 25557 |
| Base 8 | 14658 | 17138 |
| Base 9 | 11129 | 12889 |
| Base 10 | 82110 | 97110 |
| Base 11 | 68711 | 80311 |
| Base 12 | 58512 | 68b12 |
| Base 13 | 4b213 | 59913 |
| Base 14 | 42914 | 4d514 |
| Base 15 | 39b15 | 44b15 |
| Base 16 | 33516 | 3cb16 |