number.wiki
Number

1,391

1,391 is a composite number, odd, a calendar year.

Deficient Number Squarefree Year

Properties

Parity
Odd
Digit count
4
Digit sum
14
Digital root
5
Palindrome
No
Divisor count
4
σ(n) — sum of divisors
1,512

Primality

Prime factorization: 13 × 107

Divisors & multiples

All divisors (4)
1 · 13 · 107 · 1391
Aliquot sum (sum of proper divisors): 121
Factor pairs (a × b = 1,391)
1 × 1391
13 × 107
First multiples
1,391 · 2,782 · 4,173 · 5,564 · 6,955 · 8,346 · 9,737 · 11,128 · 12,519 · 13,910

Representations

In words
one thousand three hundred ninety-one
Ordinal
1391st
Roman numeral
MCCCXCI
Binary
10101101111
Octal
2557
Hexadecimal
56F

Also seen as

Unicode codepoint
կ
U+056F
Lowercase letter (Ll)

UTF-8 encoding: D5 AF (2 bytes).

Hex color
#00056F
RGB(0, 5, 111)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.111.