Compare 1981 vs 1986
| Property | 1981 | 1986 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 3 |
| Total factors | 2 | 3 |
| Prime factorization | 71 × 2831 | 21 × 31 × 3311 |
| Prime factorization | 7 × 283 | 2 × 3 × 331 |
| Divisors count | 4 | 8 |
| Divisors | 1, 7, 283, 1981 | 1, 2, 3, 6, 331, 662, 993, 1986 |
| Number of properties | 1 | 0 |
| Semiprimes | 572nd | |
| Roman numberals | MCMLXXXI | MCMLXXXVI |
| Base 2 | 111101111012 | 111110000102 |
| Base 3 | 22011013 | 22011203 |
| Base 4 | 1323314 | 1330024 |
| Base 5 | 304115 | 304215 |
| Base 6 | 131016 | 131106 |
| Base 7 | 55307 | 55357 |
| Base 8 | 36758 | 37028 |
| Base 9 | 26419 | 26469 |
| Base 10 | 198110 | 198610 |
| Base 11 | 154111 | 154611 |
| Base 12 | 119112 | 119612 |
| Base 13 | b9513 | b9a13 |
| Base 14 | a1714 | a1c14 |
| Base 15 | 8c115 | 8c615 |
| Base 16 | 7bd16 | 7c216 |