Number 1991

Representations of 1991
Greek numeral
͵αϡϟαʹ
Sanskrit numeral
१९९१
Arabic numeral
١٩٩١
Roman numeral
MCMXCI
Maya numeral
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Chinese numeral
一千九百九十一
Hebrew numeral
א׳ תתקצא
1991 in different numeral systems
Binary
11111000111
Base-3
2201202
Base-4
133013
Base-5
30431
Base-6
13115
Base-7
5543
Base-8
3707
Duodecimal
119b
Hex
7c7
Vigesimal
4jb
Base-24
3an
Base-36
1jb
Negabinary
1100011011011
Factorization
Prime factors
11, 181
Divisors
1, 11, 181, 1991
Sum of divisors other than 1991
193
Product of prime factors
1991 = 11 x 181
Characteristics
Difference of 2 squares Palindromic Odd Composite Deficient
Related primes
Number 1991 prime
17321
Prime number before 1991
1987
Prime number after 1991
1993