1991
Number 1991 properties
- 1991 is an odd number.
- 1991 is a palindrome.
Number 1991 - properties and curiosities
1991 (number)
Prime factorization
Prime factorization of 1991: 11 × 181.
Divisors
Divisor count: 4
1, 11, 181, 1991
Factors of 1991 are: 1, 11, 181, 1991.
Representations
In octal, 1991 is represented as 3707.
In binary, 1991 is represented as 11111000111.
In hex, 1991 is represented as 7C7.
Roman numeral: MCMXCI
Curiosities
- 1991 reads the same from left to right and right to left.
Related numbers
Quick answers
Is 1991 prime?
No, 1991 is not prime.
What are the factors of 1991?
1, 11, 181, 1991
What is 1991 in binary?
11111000111