Compare 1561 vs 1567
| Property | 1561 | 1567 |
|---|---|---|
| Type | semiprime | prime |
| Unique factors | 2 | 1 |
| Total factors | 2 | 1 |
| Prime factorization | 71 × 2231 | 15671 |
| Prime factorization | 7 × 223 | 1567 |
| Divisors count | 4 | 2 |
| Divisors | 1, 7, 223, 1561 | 1, 1567 |
| Number of properties | 1 | 7 |
| Additive primes | 134th | |
| Chen primes | 158th | |
| Cousin primes (1st member) | 55th | |
| Isolated primes | 148th | |
| Long primes | 95th | |
| Lucky primes | 59th | |
| Primes | 247th | |
| Semiprimes | 453rd | |
| Roman numberals | MDLXI | MDLXVII |
| Base 2 | 110000110012 | 110000111112 |
| Base 3 | 20102113 | 20110013 |
| Base 4 | 1201214 | 1201334 |
| Base 5 | 222215 | 222325 |
| Base 6 | 111216 | 111316 |
| Base 7 | 43607 | 43667 |
| Base 8 | 30318 | 30378 |
| Base 9 | 21249 | 21319 |
| Base 10 | 156110 | 156710 |
| Base 11 | 119a11 | 11a511 |
| Base 12 | aa112 | aa712 |
| Base 13 | 93113 | 93713 |
| Base 14 | 7d714 | 7dd14 |
| Base 15 | 6e115 | 6e715 |
| Base 16 | 61916 | 61f16 |