Compare 819 vs 821
| Property | 819 | 821 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 32 × 71 × 131 | 8211 |
| Prime factorization | 3 × 3 × 7 × 13 | 821 |
| Divisors count | 12 | 2 |
| Divisors | 1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273, 819 | 1, 821 |
| Number of properties | 0 | 10 |
| Additive primes | 75th | |
| Chen primes | 97th | |
| Good primes | 40th | |
| Long primes | 50th | |
| Primes | 142nd | |
| Prime quadruplets (1st member) | 5th | |
| Prime triplets (1st member) | 25th | |
| Pythagorean primes | 69th | |
| Sexy primes (1st member) | 64th | |
| Twin primes (1st member) | 32nd | |
| Roman numberals | DCCCXIX | DCCCXXI |
| Base 2 | 11001100112 | 11001101012 |
| Base 3 | 10101003 | 10101023 |
| Base 4 | 303034 | 303114 |
| Base 5 | 112345 | 112415 |
| Base 6 | 34436 | 34456 |
| Base 7 | 22507 | 22527 |
| Base 8 | 14638 | 14658 |
| Base 9 | 11109 | 11129 |
| Base 10 | 81910 | 82110 |
| Base 11 | 68511 | 68711 |
| Base 12 | 58312 | 58512 |
| Base 13 | 4b013 | 4b213 |
| Base 14 | 42714 | 42914 |
| Base 15 | 39915 | 39b15 |
| Base 16 | 33316 | 33516 |