891

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 5 (2 unique) factors are:
3⁴ = 81
11

Its 10 divisors are:
1
3
9
11
27
33
81
99
297
891
Its aliquote sum is:
561
makeing it a deficient number.

As Unicode codepoint (since version 5.0) this number represents this character:ͻ GREEK SMALL REVERSED LUNATE SIGMA SYMBOL in Greek (Source: https://ucdapi.org/unicode/latest/codepoint/dec/891); HTML: ͻ

In the work of Johann Sebastian Bach BWV 891 is Praeludium und Fuge b-Moll (Das Wohltemperierte Klavier, Teil 2)

The number appears at position 481 of the decimal digits of π surrounded by
6274956735188575272489122793818301194912983 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: 1074.819ms; cpu: 97.9510000000001ms)