1911
1911 is the year Amundsen reached the South Pole.
- Odd
- Composite
Where 1911 fits
Why 1911 is special
He arrived five weeks before Scott, who died on the return journey. Amundsen used dogs and skis and treated the trip as a logistics problem; the contrast between the two expeditions is a standard case study in planning.
Same number, different meanings
How 1911 is understood across different contexts — never implying one meaning because of another.
- Mathematics
He arrived five weeks before Scott, who died on the return journey. Amundsen used dogs and skis and treated the trip as a logistics problem; the contrast between the two expeditions is a standard case study in planning.
- Science
In 1911, Rutherford proposed the nuclear atom, and Amundsen reached the South Pole.
- Geography
Amundsen reached the pole in 1911 by treating it as a supply and transport exercise — dogs, skis, depots laid in advance. Scott's party, using ponies and man-hauling, arrived later and died returning. The difference is method rather than fortune.
1911 is part of
Factors & digit properties
- Divisors (12)
- 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637, 1911
- Prime factorisation
- 3 × 7^2 × 13
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 1911
- Scientific notation
- 1.911 × 10^3
Roman numerals
M C M X I
MCMXI uses the subtractive pair CM: a hundred before a thousand — a thousand minus a hundred.
Binary
1 1 1 0 1 1 1 0 1 1 1
1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,911
Octal
3 5 6 7
3 × 512 + 5 × 64 + 6 × 8 + 7 × 1 = 1,911
Hexadecimal
7 7 7
7 × 256 + 7 × 16 + 7 × 1 = 1,911
Read as powers of two: 1,024 + 512 + 256 + 64 + 32 + 16 + 4 + 2 + 1 = 1,911.
In historical numeral systems
Egyptian
1 lotus, 9 coils of rope, 1 hobble, 1 stroke
1 × 1,000 + 9 × 100 + 1 × 10 + 1 × 1 = 1,911. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 1 vertical wedge (sixties place), 5 corner wedges + 1 vertical wedge (units place)
31 × 60 + 51 = 1911. 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
Related numbers & connections
1911 is a year in the 20th century, in the 1910s.
The Sherman Act of 1890 was written against industrial trusts and used first against unions; the 1911 Standard Oil breakup finally applied it as intended.
View 1890 →Science
In 1911, Rutherford proposed the nuclear atom, and Amundsen reached the South Pole.
DocumentedScienceGeography: globalPeriod: 1911
Geography
Amundsen reached the pole in 1911 by treating it as a supply and transport exercise — dogs, skis, depots laid in advance. Scott's party, using ponies and man-hauling, arrived later and died returning. The difference is method rather than fortune.
DocumentedGeographyGeography: AntarcticaPeriod: 1911
Common questions
Is 1911 a prime number?
No, 1911 is not prime.
What are the factors of 1911?
The factors of 1911 are 1, 3, 7, 13, 21, 39, 49, 91, 147, 273, 637, 1911.
What is 1911 in Roman numerals?
1911 in Roman numerals is MCMXI. CM is subtractive: a hundred before a thousand — a thousand minus a hundred. Written additively it would be MDCCCCXI, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026