One thousand five hundred twenty one
1521 is an odd number.
1521 is a Harshad number, which means it is divisible by the sum of its digits (1 + 5 + 2 + 1 = 9, and 1521 is divisible by 9).
In binary, 1521 is represented as 10111110001.
In hex, 1521 is represented as 5f1.
Prime factorization of 1521: 32 * 132.