581
K. 581 is the Clarinet Quintet.
- Odd
- Composite
Where 581 fits
Why 581 is special
It was written for a basset clarinet with extra low notes, and every standard performance transposes those passages upward because the instrument fell out of use.
Factors & digit properties
- Divisors (4)
- 1, 7, 83, 581
- Prime factorisation
- 7 × 83
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 581
- Binary
- 1001000101
- Octal
- 1105
- Hexadecimal
- 245
- Roman numeral
- DLXXXI
- Scientific notation
- 5.810 × 10^2
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Both are late works written for specific players or occasions rather than for publication.
View 543 →Other connections
- is associated with543
why?
Strength 0.50, confidence "high".
Media & popular culture
K. 581 was composed for Anton Stadler's basset clarinet with an extended lower range. Standard clarinets cannot play the original low passages, which are routinely transposed.
DocumentedMedia & popular cultureGeography: AustriaPeriod: 1789
Common questions
Is 581 a prime number?
No, 581 is not prime.
What are the factors of 581?
The factors of 581 are 1, 7, 83, 581.
What is 581 in Roman numerals?
581 in Roman numerals is DLXXXI.
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