1013
Standard atmospheric pressure at sea level is 1,013 hectopascals.
- Odd
- Prime
Where 1013 fits
Why 1013 is special
It is the same pressure as 760 mm of mercury, expressed in the unit weather forecasts use. Readings below about 1,000 hPa indicate a depression; the lowest recorded at sea level, in Typhoon Tip in 1979, was 870 hPa.
Same number, different meanings
How 1013 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It is the same pressure as 760 mm of mercury, expressed in the unit weather forecasts use. Readings below about 1,000 hPa indicate a depression; the lowest recorded at sea level, in Typhoon Tip in 1979, was 870 hPa.
- History
In 1013, Sweyn Forkbeard completed the Danish conquest of England (England).
- Science
1,013 hPa is standard sea-level pressure, the same as 760 mm of mercury in the unit meteorology uses. Below about 1,000 hPa indicates a depression; the lowest sea-level reading ever recorded was 870 hPa in Typhoon Tip in 1979.
1013 is part of
Factors & digit properties
- Divisors (2)
- 1, 1013
- Prime factorisation
- 1013
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 1013
- Scientific notation
- 1.013 × 10^3
Roman numerals
M X I I I
Binary
1 1 1 1 1 1 0 1 0 1
1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 1,013
Octal
1 7 6 5
1 × 512 + 7 × 64 + 6 × 8 + 5 × 1 = 1,013
Hexadecimal
3 f 5
3 × 256 + f × 16 + 5 × 1 = 1,013
Read as powers of two: 512 + 256 + 128 + 64 + 32 + 16 + 4 + 1 = 1,013.
In historical numeral systems
Egyptian
1 lotus, 1 hobble, 3 strokes
1 × 1,000 + 1 × 10 + 3 × 1 = 1,013. 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), 5 corner wedges + 3 vertical wedges (units place)
16 × 60 + 53 = 1013. 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
- Sophie Germain prime
Related numbers & connections
1013 is a year in the 11th century, in the 1010s.
The same standard sea-level pressure in two units — 1,013 hPa and 760 mm of mercury. Meteorology uses the first and medicine still largely uses the second.
View 760 →History
In 1013, Sweyn Forkbeard completed the Danish conquest of England (England).
DocumentedHistoryGeography: EnglandPeriod: 1013
Science
1,013 hPa is standard sea-level pressure, the same as 760 mm of mercury in the unit meteorology uses. Below about 1,000 hPa indicates a depression; the lowest sea-level reading ever recorded was 870 hPa in Typhoon Tip in 1979.
DocumentedScience
Common questions
Is 1013 a prime number?
Yes, 1013 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1013?
The factors of 1013 are 1, 1013.
What is 1013 in Roman numerals?
1013 in Roman numerals is MXIII.
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