3115
NGC 3115 is the Spindle Galaxy.
- Odd
- Composite
Where 3115 fits
Why 3115 is special
It is a lenticular galaxy seen edge-on, and its central black hole was among the first for which a mass was measured from stellar motions.
Factors & digit properties
- Divisors (8)
- 1, 5, 7, 35, 89, 445, 623, 3115
- Prime factorisation
- 5 × 7 × 89
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 3115
- Scientific notation
- 3.115 × 10^3
Roman numerals
M M M C X V
Binary
1 1 0 0 0 0 1 0 1 0 1 1
1 × 2,048 + 1 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 3,115
Octal
6 0 5 3
6 × 512 + 0 × 64 + 5 × 8 + 3 × 1 = 3,115
Hexadecimal
c 2 b
c × 256 + 2 × 16 + b × 1 = 3,115
Read as powers of two: 2,048 + 1,024 + 32 + 8 + 2 + 1 = 3,115.
In historical numeral systems
Egyptian
3 lotuses, 1 coil of rope, 1 hobble, 5 strokes
3 × 1,000 + 1 × 100 + 1 × 10 + 5 × 1 = 3,115. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
5 corner wedges + 1 vertical wedge (sixties place), 5 corner wedges + 5 vertical wedges (units place)
51 × 60 + 55 = 3115. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
Related numbers & connections
Both provided early dynamical black hole mass measurements from the motions of stars near their centres.
View 4486 →Science
NGC 3115 is an edge-on lenticular galaxy. Measurements of stellar velocities near its centre provided one of the earliest dynamical black hole mass estimates.
DocumentedSciencePeriod: 1787–
Common questions
Is 3115 a prime number?
No, 3115 is not prime.
What are the factors of 3115?
The factors of 3115 are 1, 5, 7, 35, 89, 445, 623, 3115.
What is 3115 in Roman numerals?
3115 in Roman numerals is MMMCXV.
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: 15 July 2026