Compare 1991 vs 2000
| Property | 1991 | 2000 |
|---|---|---|
| Type | semiprime | composite number |
| Unique factors | 2 | 2 |
| Total factors | 2 | 7 |
| Prime factorization | 111 × 1811 | 24 × 53 |
| Prime factorization | 11 × 181 | 2 × 2 × 2 × 2 × 5 × 5 × 5 |
| Divisors count | 4 | 20 |
| Divisors | 1, 11, 181, 1991 | 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 2000 |
| Number of properties | 1 | 0 |
| Semiprimes | 576th | |
| Roman numberals | MCMXCI | MM |
| Base 2 | 111110001112 | 111110100002 |
| Base 3 | 22012023 | 22020023 |
| Base 4 | 1330134 | 1331004 |
| Base 5 | 304315 | 310005 |
| Base 6 | 131156 | 131326 |
| Base 7 | 55437 | 55557 |
| Base 8 | 37078 | 37208 |
| Base 9 | 26529 | 26629 |
| Base 10 | 199110 | 200010 |
| Base 11 | 155011 | 155911 |
| Base 12 | 119b12 | 11a812 |
| Base 13 | ba213 | bab13 |
| Base 14 | a2314 | a2c14 |
| Base 15 | 8cb15 | 8d515 |
| Base 16 | 7c716 | 7d016 |