9090

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 5 (4 unique) factors are:
2
3² = 9
5
101

Its 24 divisors are:
1
2
3
5
6
9
10
15
18
30
45
90
101
202
303
505
606
909
1010
1515
1818
3030
4545
9090
Its aliquote sum is:
14778
makeing it a abundant number.

As Unicode codepoint (since version 3.0) this number represents this character:⎂ DISCONTINUOUS UNDERLINE SYMBOL in Misc_Technical (Source: https://ucdapi.org/unicode/latest/codepoint/dec/9090); HTML: ⎂

The number appears at position 2072 of the decimal digits of π surrounded by
67194782684826014769909026401363944374553050 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: 870.903ms; cpu: 68.2240000000007ms)