153

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 3 (2 unique) factors are:
3² = 9
17

Its 6 divisors are:
1
3
9
17
51
153
Its aliquote sum is:
81
makeing it a deficient number.

As Unicode codepoint (since version 1.1) this number represents this character:™ SINGLE GRAPHIC CHARACTER INTRODUCER (SGC) in Latin-1 Supplement (Source: https://unicode-api.aaronluna.dev/v1/codepoints/99?show_props=Basic); HTML: ™

In the work of Johann Sebastian Bach BWV 153 is Schau, lieber Gott, wie meine Feind

The number appears at position 344 of the decimal digits of π surrounded by
1520920962829254091715364367892590360011330 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: 1733.421ms; cpu: 87.817ms)