2903
NGC 2903 is a bright barred spiral Messier missed.
- Odd
- Prime
Where 2903 fits
Why 2903 is special
It is brighter than several objects in the Messier catalogue and was omitted from it, which shows the catalogue was a list of things not to mistake for comets rather than a survey.
2903 is part of
Factors & digit properties
- Divisors (2)
- 1, 2903
- Prime factorisation
- 2903
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 2903
- Scientific notation
- 2.903 × 10^3
Roman numerals
M M C M I I I
MMCMIII uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 0 1 1 0 1 0 1 0 1 1 1
1 × 2,048 + 0 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 2,903
Octal
5 5 2 7
5 × 512 + 5 × 64 + 2 × 8 + 7 × 1 = 2,903
Hexadecimal
b 5 7
b × 256 + 5 × 16 + 7 × 1 = 2,903
Read as powers of two: 2,048 + 512 + 256 + 64 + 16 + 4 + 2 + 1 = 2,903.
In historical numeral systems
Egyptian
2 lotuses, 9 coils of rope, 3 strokes
2 × 1,000 + 9 × 100 + 3 × 1 = 2,903. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges + 8 vertical wedges (sixties place), 2 corner wedges + 3 vertical wedges (units place)
48 × 60 + 23 = 2903. 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
- Happy number
- Sophie Germain prime
- Safe prime
Related numbers & connections
NGC 2903 is brighter than several Messier objects and absent from that catalogue, which shows what the catalogue was for.
View 1300 →Other connections
- contrasts with1300
why?
Strength 0.50, confidence "high".
Science
NGC 2903 in Leo is a barred spiral of comparable brightness to catalogued Messier objects, absent from that catalogue because it was compiled to exclude comet look-alikes rather than systematically.
DocumentedSciencePeriod: 1784–
Common questions
Is 2903 a prime number?
Yes, 2903 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 2903?
The factors of 2903 are 1, 2903.
What is 2903 in Roman numerals?
2903 in Roman numerals is MMCMIII. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be MMDCCCCIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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