1003
IEEE 1003 is POSIX.
- Odd
- Composite
Where 1003 fits
Why 1003 is special
It defines what a Unix-like system must provide, which is why a program written for one can be compiled on another, and why Windows shipped a subsystem to claim compliance.
Same number, different meanings
How 1003 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It defines what a Unix-like system must provide, which is why a program written for one can be compiled on another, and why Windows shipped a subsystem to claim compliance.
- History
In 1003, Sweyn Forkbeard began the campaign of retaliation that ended in the Danish conquest of England (England).
- Technology & computing
IEEE 1003 specifies the Portable Operating System Interface, standardising system calls, shell and utilities. Conformance was a procurement requirement in United States federal purchasing.
Factors & digit properties
- Divisors (4)
- 1, 17, 59, 1003
- Prime factorisation
- 17 × 59
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 1003
- Scientific notation
- 1.003 × 10^3
Roman numerals
M I I I
Binary
1 1 1 1 1 0 1 0 1 1
1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,003
Octal
1 7 5 3
1 × 512 + 7 × 64 + 5 × 8 + 3 × 1 = 1,003
Hexadecimal
3 e b
3 × 256 + e × 16 + b × 1 = 1,003
Read as powers of two: 512 + 256 + 128 + 64 + 32 + 8 + 2 + 1 = 1,003.
In historical numeral systems
Egyptian
1 lotus, 3 strokes
1 × 1,000 + 3 × 1 = 1,003. 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 + 3 vertical wedges (units place)
16 × 60 + 43 = 1003. 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
- Semiprime
Related numbers & connections
1003 is a year in the 11th century, in the 1000s.
POSIX and the network standards are the two portability layers that let software move between systems.
View 8802 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
- appears inNumbers assigned as identifiers
why?
Strength 0.50, confidence "high".
- appears inStandards issued by an organisation
why?
Strength 0.50, confidence "high".
History
In 1003, Sweyn Forkbeard began the campaign of retaliation that ended in the Danish conquest of England (England).
DocumentedHistoryGeography: EnglandPeriod: 1003
Technology & computing
IEEE 1003 specifies the Portable Operating System Interface, standardising system calls, shell and utilities. Conformance was a procurement requirement in United States federal purchasing.
DocumentedTechnology & computingGeography: International — IEEEPeriod: 1988–
Common questions
Is 1003 a prime number?
No, 1003 is not prime.
What are the factors of 1003?
The factors of 1003 are 1, 17, 59, 1003.
What is 1003 in Roman numerals?
1003 in Roman numerals is MIII.
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