Numberwise

891

NGC 891 is the edge-on spiral with visible dust filaments.

1 confirmed record · 1 sourceChecked, general knowledgeHow we qualify claimsReport a correction

Where 891 fits

Where 891 fits: Related numbersRelated numbers: 4631, 4565, 1055.Related numbers463145651055891
891 connects to 1 world: related numbers.

Why 891 is special

Deep images show dust extending vertically out of the disc, lifted by star formation, which is the process that seeds the halo with heavy elements.

Factors & digit properties

Divisors (10)
1, 3, 9, 11, 27, 33, 81, 99, 297, 891
Prime factorisation
3^4 × 11
Digit sum
18
Digital root
9

Representations

Decimal
891
Binary
1101111011
Octal
1573
Hexadecimal
37b
Roman numeral
DCCCXCI
Scientific notation
8.910 × 10^2

Other mathematical patterns

  • Deficient number

Related numbers & connections

Connection
Both are edge-on spirals showing material lifted vertically out of the disc by star formation.

Both are edge-on spirals showing material lifted vertically out of the disc by star formation.

View 4631 →

Other connections

  • is associated with4631
    why?

    Strength 0.50, confidence "high".

  • is associated with4565
    why?

    Strength 0.50, confidence "high".

  • is associated with1055
    why?

    Strength 0.50, confidence "high".

How is 891 connected to another number? →

Science

  • NGC 891 is an edge-on spiral showing filamentary dust extending perpendicular to the plane, associated with supernova-driven outflow from the disc.

    DocumentedSciencePeriod: 1784–

Common questions

Is 891 a prime number?

No, 891 is not prime.

What are the factors of 891?

The factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891.

What is 891 in Roman numerals?

891 in Roman numerals is DCCCXCI.

About this page's data

Mathematical facts:computed directly from the number's value — nothing to source or verify externally.

Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.

Last reviewed: 3 August 2026