855

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 4 (3 unique) factors are:
3² = 9
5
19

Its 12 divisors are:
1
3
5
9
15
19
45
57
95
171
285
855
Its aliquote sum is:
705
makeing it a deficient number.

As Unicode codepoint (since version 4.0) this number represents this character:͗ COMBINING RIGHT HALF RING ABOVE in Diacriticals (Source: https://www.unicode.org/Public/UCD/latest/ucdxml/ucd.all.grouped.zip); HTML: ͗

In the work of Johann Sebastian Bach BWV 855 is Praeludium und Fuge e-Moll (Das Wohltemperierte Klavier, Teil 1)

The number appears at position 1138 of the decimal digits of π surrounded by
9595082953311686172785588907509838175463746 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: 619.177ms; cpu: 82.0360000000004ms)