1501
NGC 1501 is the Oyster Nebula.
- Odd
- Composite
Where 1501 fits
Why 1501 is special
Its central star pulsates, which is unusual and gives a direct handle on the mass and structure of a star at that stage.
Same number, different meanings
How 1501 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Its central star pulsates, which is unusual and gives a direct handle on the mass and structure of a star at that stage.
- History
In 1501, Ismail I founded the Safavid dynasty and made Twelver Shia Islam the state religion of Iran (Persia).
- Science
NGC 1501 is a planetary nebula whose central star is a pulsating variable, allowing asteroseismic constraints on the star's properties.
1501 is part of
Factors & digit properties
- Divisors (4)
- 1, 19, 79, 1501
- Prime factorisation
- 19 × 79
- Digit sum
- 7
- Digital root
- 7
Representations
- Decimal
- 1501
- Scientific notation
- 1.501 × 10^3
Roman numerals
M D I
Binary
1 0 1 1 1 0 1 1 1 0 1
1 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 1,501
Octal
2 7 3 5
2 × 512 + 7 × 64 + 3 × 8 + 5 × 1 = 1,501
Hexadecimal
5 d d
5 × 256 + d × 16 + d × 1 = 1,501
Read as powers of two: 1,024 + 256 + 128 + 64 + 16 + 8 + 4 + 1 = 1,501.
In historical numeral systems
Egyptian
1 lotus, 5 coils of rope, 1 stroke
1 × 1,000 + 5 × 100 + 1 × 1 = 1,501. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges + 5 vertical wedges (sixties place), 1 vertical wedge (units place)
25 × 60 + 1 = 1501. 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
- Lucky number (mathematical sieve)
Related numbers & connections
1501 is a year in the 16th century, in the 1500s.
Both are planetary nebulae; one has a pulsating central star that allows its properties to be measured directly.
View 6853 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- is associated with6853
why?
Strength 0.50, confidence "high".
History
In 1501, Ismail I founded the Safavid dynasty and made Twelver Shia Islam the state religion of Iran (Persia).
DocumentedHistoryGeography: PersiaPeriod: 1501
Science
NGC 1501 is a planetary nebula whose central star is a pulsating variable, allowing asteroseismic constraints on the star's properties.
DocumentedSciencePeriod: 1787–
Common questions
Is 1501 a prime number?
No, 1501 is not prime.
What are the factors of 1501?
The factors of 1501 are 1, 19, 79, 1501.
What is 1501 in Roman numerals?
1501 in Roman numerals is MDI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026