3521
NGC 3521 is a flocculent spiral galaxy.
- Odd
- Composite
Where 3521 fits
Why 3521 is special
Instead of two clean arms it has many short broken ones, which is a genuinely different kind of spiral structure rather than a poorer example of the usual kind.
Factors & digit properties
- Divisors (4)
- 1, 7, 503, 3521
- Prime factorisation
- 7 × 503
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 3521
- Scientific notation
- 3.521 × 10^3
Roman numerals
M M M D X X I
Binary
1 1 0 1 1 1 0 0 0 0 0 1
1 × 2,048 + 1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 3,521
Octal
6 7 0 1
6 × 512 + 7 × 64 + 0 × 8 + 1 × 1 = 3,521
Hexadecimal
d c 1
d × 256 + c × 16 + 1 × 1 = 3,521
Read as powers of two: 2,048 + 1,024 + 256 + 128 + 64 + 1 = 3,521.
In historical numeral systems
Egyptian
3 lotuses, 5 coils of rope, 2 hobbles, 1 stroke
3 × 1,000 + 5 × 100 + 2 × 10 + 1 × 1 = 3,521. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
5 corner wedges + 8 vertical wedges (sixties place), 4 corner wedges + 1 vertical wedge (units place)
58 × 60 + 41 = 3521. 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
- Semiprime
Related numbers & connections
Both are Leo-region spirals, one showing a tidal tail from interaction and one a flocculent disc.
View 3628 →Flocculent and grand-design spirals are genuinely different structures rather than better and worse examples of one.
View 5194 →Science
NGC 3521 is a flocculent spiral whose disc shows many discontinuous arm segments rather than grand-design arms, reflecting a different mechanism of arm formation.
DocumentedSciencePeriod: 1784–
Common questions
Is 3521 a prime number?
No, 3521 is not prime.
What are the factors of 3521?
The factors of 3521 are 1, 7, 503, 3521.
What is 3521 in Roman numerals?
3521 in Roman numerals is MMMDXXI.
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