1671
1671 is the year Leibniz designed a calculator that could multiply.
- Odd
- Composite
Where 1671 fits
Why 1671 is special
Pascal's earlier machine could only add and subtract. The stepped drum Leibniz devised was used in mechanical calculators for the next three centuries.
Factors & digit properties
- Divisors (4)
- 1, 3, 557, 1671
- Prime factorisation
- 3 × 557
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 1671
- Binary
- 11010000111
- Octal
- 3207
- Hexadecimal
- 687
- Roman numeral
- MDCLXXI
- Scientific notation
- 1.671 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Napier's rods mechanised multiplication by hand in 1617; Leibniz's stepped drum of 1671 mechanised it in a machine, and that mechanism was still in calculators three centuries later.
View 1617 →Other connections
- developed from1617
why?
Strength 0.50, confidence "high".
Technology & computing
Leibniz's stepped drum of 1671 enabled mechanical multiplication and remained in use in calculating machines into the twentieth century. Few mechanisms have that longevity.
DocumentedTechnology & computingGeography: GermanyPeriod: 1671
Common questions
Is 1671 a prime number?
No, 1671 is not prime.
What are the factors of 1671?
The factors of 1671 are 1, 3, 557, 1671.
What is 1671 in Roman numerals?
1671 in Roman numerals is MDCLXXI.
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: 3 August 2026