543
K. 543 is the first of the final three symphonies.
- Odd
- Composite
Where 543 fits
Why 543 is special
Mozart wrote all three in about six weeks in 1788 with no known commission and no record of ever hearing them performed.
Factors & digit properties
- Divisors (4)
- 1, 3, 181, 543
- Prime factorisation
- 3 × 181
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 543
- Scientific notation
- 5.430 × 10^2
Roman numerals
D X L I I I
DXLIII uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 0 0 1 1 1 1 1
1 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 543
Octal
1 0 3 7
1 × 512 + 0 × 64 + 3 × 8 + 7 × 1 = 543
Hexadecimal
2 1 f
2 × 256 + 1 × 16 + f × 1 = 543
Read as powers of two: 512 + 16 + 8 + 4 + 2 + 1 = 543.
In historical numeral systems
Egyptian
5 coils of rope, 4 hobbles, 3 strokes
5 × 100 + 4 × 10 + 3 × 1 = 543. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
9 vertical wedges (sixties place), 3 vertical wedges (units place)
9 × 60 + 3 = 543. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
phi, then mu, then gamma, marked as a numeral
phi-mu-gamma + keraia
phi + mu + gamma written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then qof, then mem, then gimel
tav-qof-mem-gimel
tav (400) + qof (100) + mem (40) + gimel (3) = 543, written in descending order.
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
Related numbers & connections
Both are Mozart works for which no commission or first performance is documented.
View 525 →Media & popular culture
K. 543 is the first of the symphonies numbered 39, 40 and 41, composed within roughly six weeks in summer 1788. No commission or documented performance survives.
DocumentedMedia & popular cultureGeography: AustriaPeriod: 1788
Common questions
Is 543 a prime number?
No, 543 is not prime.
What are the factors of 543?
The factors of 543 are 1, 3, 181, 543.
What is 543 in Roman numerals?
543 in Roman numerals is DXLIII. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be DXXXXIII, 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: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026