45

Properties by base:

Base 1045 (2 digits)
Digit Sum: 9
Digital Root: 9 sad
Base 20b101101 (6 digits)
Digit Sum: 0b100
Digital Root: 0b1 always happy
Base 8055 (2 digits)
Digit Sum: 012
Digital Root: 03 sad
Base 160x2d (2 digits)
Digit Sum: 0xf
Digital Root: 0xf sad

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 3 (2 unique) factors are:
32 = 9
5

Its 6 divisors are:
1
3
5
9
15
45
Its aliquote sum is:
33
makeing it a deficient number.

In HTML this number represents this color:  
#00002D
 

As Unicode codepoint (since version 1.1) this number represents this character:- HYPHEN-MINUS in ASCII (Source: https://ucdapi.org/unicode/latest/codepoint/dec/45); HTML: -

In the work of Johann Sebastian Bach BWV 45 is Es ist dir gesagt, Mensch, was gut ist

The number appears at position 60 of the decimal digits of π surrounded by
169399375105820974944592307816406286208998 Source: The Pi-Search Page

Computations done with Math::BigInt 1.999811 and Math::Pari 2.030523 based on PARI/GP 2.11.3 (elapsed: 946.757ms; cpu: 85.5929999999998ms)


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