Numberwise

5981

NGC 5981 is part of the Draco Trio.

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

Where 5981 fits

Where 5981 fits: Mathematics, Related numbersMathematics: Prime. Related numbers: 4565.MathematicsPrimeRelated numbers45655981
5981 connects to 2 worlds: mathematics, related numbers.

Why 5981 is special

Three galaxies appear in one field at three different orientations, which makes the group a standard demonstration of how inclination changes appearance.

5981 is part of

Prime numbers

Factors & digit properties

Divisors (2)
1, 5981
Prime factorisation
5981
Digit sum
23
Digital root
5

Representations

Decimal
5981
Binary
1011101011101
Octal
13535
Hexadecimal
175d
Scientific notation
5.981 × 10^3

Other mathematical patterns

  • Deficient number

Related numbers & connections

Connection
Both are edge-on spirals used to demonstrate how inclination alone changes a galaxy's appearance.

Both are edge-on spirals used to demonstrate how inclination alone changes a galaxy's appearance.

View 4565 →

Other connections

  • is associated with4565
    why?

    Strength 0.50, confidence "high".

How is 5981 connected to another number? →

Science

  • NGC 5981 is an edge-on spiral forming a visual grouping with NGC 5982 and NGC 5985, which present edge-on, elliptical and face-on appearances respectively.

    DocumentedSciencePeriod: 1788–

Common questions

Is 5981 a prime number?

Yes, 5981 is prime — it has exactly two positive divisors: 1 and itself.

What are the factors of 5981?

The factors of 5981 are 1, 5981.

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