number.wiki
Number

145

145 is a composite number, odd, a calendar year.

Deficient Number Pentagonal Squarefree Year

Properties

Parity
Odd
Digit count
3
Digit sum
10
Digital root
1
Palindrome
No
Divisor count
4
σ(n) — sum of divisors
180

Primality

Prime factorization: 5 × 29

Divisors & multiples

All divisors (4)
1 · 5 · 29 · 145
Aliquot sum (sum of proper divisors): 35
Factor pairs (a × b = 145)
1 × 145
5 × 29
First multiples
145 · 290 · 435 · 580 · 725 · 870 · 1,015 · 1,160 · 1,305 · 1,450

Representations

In words
one hundred forty-five
Ordinal
145th
Roman numeral
CXLV
Binary
10010001
Octal
221
Hexadecimal
91

Also seen as

Unicode codepoint
‘
U+0091
Control character (Cc)

UTF-8 encoding: C2 91 (2 bytes).

Hex color
#000091
RGB(0, 0, 145)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.145.