Compare 201981 vs 201991
| Property | 201981 | 201991 |
|---|---|---|
| Type | composite number | semiprime |
| Unique factors | 3 | 2 |
| Total factors | 3 | 2 |
| Prime factorization | 31 × 131 × 51791 | 731 × 27671 |
| Prime factorization | 3 × 13 × 5179 | 73 × 2767 |
| Divisors count | 8 | 4 |
| Divisors | 1, 3, 13, 39, 5179, 15537, 67327, 201981 | 1, 73, 2767, 201991 |
| Number of properties | 0 | 1 |
| Semiprimes | 45656th | |
| Roman numberals | ||
| Base 2 | 1100010100111111012 | 1100010101000001112 |
| Base 3 | 1010210012103 | 1010210020113 |
| Base 4 | 3011033314 | 3011100134 |
| Base 5 | 224304115 | 224304315 |
| Base 6 | 41550336 | 41550516 |
| Base 7 | 15006037 | 15006167 |
| Base 8 | 6123758 | 6124078 |
| Base 9 | 3370539 | 3370649 |
| Base 10 | 20198110 | 20199110 |
| Base 11 | 12882a11 | 12883911 |
| Base 12 | 98a7912 | 98a8712 |
| Base 13 | 70c2013 | 70c2a13 |
| Base 14 | 5387314 | 5387d14 |
| Base 15 | 3eca615 | 3ecb115 |
| Base 16 | 314fd16 | 3150716 |