Compare 1980 vs 1987
| Property | 1980 | 1987 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 4 | 1 |
| Total factors | 6 | 1 |
| Prime factorization | 22 × 32 × 51 × 111 | 19871 |
| Prime factorization | 2 × 2 × 3 × 3 × 5 × 11 | 1987 |
| Divisors count | 36 | 2 |
| Divisors | 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 90, 99, 110, 132, 165, 180, 198, 220, 330, 396, 495, 660, 990, 1980 | 1, 1987 |
| Number of properties | 0 | 6 |
| Good primes | 62nd | |
| Isolated primes | 181st | |
| Lucky primes | 70th | |
| Primes | 300th | |
| Sexy primes (1st member) | 127th | |
| Sexy prime triplets (1st member) | 50th | |
| Roman numberals | MCMLXXX | MCMLXXXVII |
| Base 2 | 111101111002 | 111110000112 |
| Base 3 | 22011003 | 22011213 |
| Base 4 | 1323304 | 1330034 |
| Base 5 | 304105 | 304225 |
| Base 6 | 131006 | 131116 |
| Base 7 | 55267 | 55367 |
| Base 8 | 36748 | 37038 |
| Base 9 | 26409 | 26479 |
| Base 10 | 198010 | 198710 |
| Base 11 | 154011 | 154711 |
| Base 12 | 119012 | 119712 |
| Base 13 | b9413 | b9b13 |
| Base 14 | a1614 | a1d14 |
| Base 15 | 8c015 | 8c715 |
| Base 16 | 7bc16 | 7c316 |