1819
1819 is the year of the Peterloo massacre.
- Odd
- Composite
Where 1819 fits
Why 1819 is special
Cavalry charged a peaceful crowd of around 60,000 demanding parliamentary reform, killing eighteen. The government's response was to restrict public meetings further, and the reform demanded took another thirteen years.
1819 is part of
Factors & digit properties
- Divisors (4)
- 1, 17, 107, 1819
- Prime factorisation
- 17 × 107
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 1819
- Scientific notation
- 1.819 × 10^3
Roman numerals
M D C C C X I X
MDCCCXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 1 0 0 0 1 1 0 1 1
1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,819
Octal
3 4 3 3
3 × 512 + 4 × 64 + 3 × 8 + 3 × 1 = 1,819
Hexadecimal
7 1 b
7 × 256 + 1 × 16 + b × 1 = 1,819
Read as powers of two: 1,024 + 512 + 256 + 16 + 8 + 2 + 1 = 1,819.
In historical numeral systems
Egyptian
1 lotus, 8 coils of rope, 1 hobble, 9 strokes
1 × 1,000 + 8 × 100 + 1 × 10 + 9 × 1 = 1,819. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges (sixties place), 1 corner wedge + 9 vertical wedges (units place)
30 × 60 + 19 = 1819. 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
1819 is a year in the 19th century, in the 1810s.
The Gordon Riots of 1780 were protest that outran its organisers; Peterloo in 1819 was a peaceful meeting charged by cavalry. The state's response differed from the disorder in both cases.
View 1780 →History
In 1819, the Peterloo Massacre in Manchester galvanised the movement for parliamentary reform (England).
DocumentedHistoryGeography: EnglandPeriod: 1819Cavalry charged a reform meeting at Manchester in 1819, killing eighteen and injuring hundreds. Parliament responded by passing acts further limiting public assembly and the press. The reform being asked for arrived in 1832.
DocumentedHistoryGeography: Manchester, EnglandPeriod: 1819
Common questions
Is 1819 a prime number?
No, 1819 is not prime.
What are the factors of 1819?
The factors of 1819 are 1, 17, 107, 1819.
What is 1819 in Roman numerals?
1819 in Roman numerals is MDCCCXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MDCCCXVIIII, 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