4565
NGC 4565 is the Needle Galaxy.
- Odd
- Composite
Where 4565 fits
Why 4565 is special
It is seen so precisely edge-on that its central bulge and dust lane can both be measured directly, which is rare and observationally valuable.
Factors & digit properties
- Divisors (8)
- 1, 5, 11, 55, 83, 415, 913, 4565
- Prime factorisation
- 5 × 11 × 83
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 4565
- Binary
- 1000111010101
- Octal
- 10725
- Hexadecimal
- 11d5
- Scientific notation
- 4.565 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
One spiral is seen face-on and the other edge-on, and between them they show a disc galaxy from both directions.
View 5194 →Other connections
Science
NGC 4565 is a spiral galaxy viewed almost exactly edge-on, allowing direct study of disc thickness, dust distribution and bulge structure.
DocumentedSciencePeriod: 1785–
Common questions
Is 4565 a prime number?
No, 4565 is not prime.
What are the factors of 4565?
The factors of 4565 are 1, 5, 11, 55, 83, 415, 913, 4565.
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