Compare 1981 vs 2019
| Property | 1981 | 2019 |
|---|---|---|
| Type | semiprime | semiprime |
| Unique factors | 2 | 2 |
| Total factors | 2 | 2 |
| Prime factorization | 71 × 2831 | 31 × 6731 |
| Prime factorization | 7 × 283 | 3 × 673 |
| Divisors count | 4 | 4 |
| Divisors | 1, 7, 283, 1981 | 1, 3, 673, 2019 |
| Number of properties | 1 | 1 |
| Semiprimes | 572nd | 580th |
| Roman numberals | MCMLXXXI | MMXIX |
| Base 2 | 111101111012 | 111111000112 |
| Base 3 | 22011013 | 22022103 |
| Base 4 | 1323314 | 1332034 |
| Base 5 | 304115 | 310345 |
| Base 6 | 131016 | 132036 |
| Base 7 | 55307 | 56137 |
| Base 8 | 36758 | 37438 |
| Base 9 | 26419 | 26839 |
| Base 10 | 198110 | 201910 |
| Base 11 | 154111 | 157611 |
| Base 12 | 119112 | 120312 |
| Base 13 | b9513 | bc413 |
| Base 14 | a1714 | a4314 |
| Base 15 | 8c115 | 8e915 |
| Base 16 | 7bd16 | 7e316 |