1009
1009 is a year in the 11th century. The Church of the Holy Sepulchre was destroyed on the order of the Fatimid caliph al-Hakim, a grievance later invoked for the crusades (Jerusalem).
- Odd
- Prime
Where 1009 fits
Why 1009 is special
1009 has a profile because of what happened in it rather than because of any property of the number: the Church of the Holy Sepulchre was destroyed on the order of the Fatimid caliph al-Hakim, a grievance later invoked for the crusades (Jerusalem).
1009 is part of
Factors & digit properties
- Divisors (2)
- 1, 1009
- Prime factorisation
- 1009
- Digit sum
- 10
- Digital root
- 1
Representations
- Decimal
- 1009
- Scientific notation
- 1.009 × 10^3
Roman numerals
M I X
MIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 1 1 1 1 0 0 0 1
1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,009
Octal
1 7 6 1
1 × 512 + 7 × 64 + 6 × 8 + 1 × 1 = 1,009
Hexadecimal
3 f 1
3 × 256 + f × 16 + 1 × 1 = 1,009
Read as powers of two: 512 + 256 + 128 + 64 + 32 + 16 + 1 = 1,009.
In historical numeral systems
Egyptian
1 lotus, 9 strokes
1 × 1,000 + 9 × 1 = 1,009. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 6 vertical wedges (sixties place), 4 corner wedges + 9 vertical wedges (units place)
16 × 60 + 49 = 1009. 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
- Lucky number (mathematical sieve)
Related numbers & connections
1009 is a year in the 11th century, in the 1000s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1009, the Church of the Holy Sepulchre was destroyed on the order of the Fatimid caliph al-Hakim, a grievance later invoked for the crusades (Jerusalem).
DocumentedHistoryGeography: JerusalemPeriod: 1009
Common questions
Is 1009 a prime number?
Yes, 1009 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1009?
The factors of 1009 are 1, 1009.
What is 1009 in Roman numerals?
1009 in Roman numerals is MIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MVIIII, 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