Two thousand one
2001 is an odd number.
2001 is a Harshad number, which means it is divisible by the sum of its digits (2 + 0 + 0 + 1 = 3, and 2001 is divisible by 3).
In binary, 2001 is represented as 11111010001.
In hex, 2001 is represented as 7d1.
Prime factorization of 2001: 3 * 23 * 29.