Number 1991 - properties and curiosities

One thousand nine hundred ninety one

1991 is an odd number.

1991 is a palindrome.

In binary, 1991 is represented as 11111000111.

In hex, 1991 is represented as 7c7.

Prime factorization of 1991: 11 * 181.

Factors of 1991 are: 1, 11, 181, 1991.