91

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 2 (2 unique) factors are:
7
13

Its 4 divisors are:
1
7
13
91
Its aliquote sum is:
21
makeing it a deficient number.

As Unicode codepoint (since version 1.1) this number represents this character:[ LEFT SQUARE BRACKET in ASCII (Source: https://ucdapi.org/unicode/latest/codepoint/dec/91); HTML: [

In the work of Johann Sebastian Bach BWV 91 is Gelobet seist du, Jesu Christ [Spätfassung]

The number appears at position 249 of the decimal digits of π surrounded by
233786783165271201909145648566923460348610 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: 917.109ms; cpu: 100.817000000001ms)