Compare 1609 vs 1618
| Property | 1609 | 1618 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 16091 | 21 × 8091 |
| Prime factorization | 1609 | 2 × 809 |
| Divisors count | 2 | 4 |
| Divisors | 1, 1609 | 1, 2, 809, 1618 |
| Number of properties | 6 | 1 |
| Cousin primes (1st member) | 58th | |
| Harmonic primes | 87th | |
| Primes | 254th | |
| Prime triplets (2nd member) | 42nd | |
| Pythagorean primes | 121st | |
| Semiprimes | 464th | |
| Twin primes (2nd member) | 51st | |
| Roman numberals | MDCIX | MDCXVIII |
| Base 2 | 110010010012 | 110010100102 |
| Base 3 | 20121213 | 20122213 |
| Base 4 | 1210214 | 1211024 |
| Base 5 | 224145 | 224335 |
| Base 6 | 112416 | 112546 |
| Base 7 | 44567 | 45017 |
| Base 8 | 31118 | 31228 |
| Base 9 | 21779 | 21879 |
| Base 10 | 160910 | 161810 |
| Base 11 | 123311 | 124111 |
| Base 12 | b2112 | b2a12 |
| Base 13 | 96a13 | 97613 |
| Base 14 | 82d14 | 83814 |
| Base 15 | 72415 | 72d15 |
| Base 16 | 64916 | 65216 |