Number 1991

Interestingness: 6

Visual representations

Binary image (n×n bits)
11181
Prime factorization

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
Egyptian numeral
𓆼
𓈖𓈖𓈖𓈖𓈖𓈖𓈖𓈖𓈖
𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
𓏹
Morse code
.--------.----..----

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 × 181

Number-theory characteristics (5)

Difference of 2 squares Evil number Odd Composite Deficient

Base-10 digit properties (1)

These depend on the decimal representation of the number.

Palindromic

Related primes

Number 1991 prime
Prime number before 1991
Prime number after 1991