289
289 is the small-block Ford displacement.
Where 289 fits
Why 289 is special
It is the engine in the original Shelby Cobra and Mustang, and the small block's compact size is what made those cars possible.
289 is part of
Factors & digit properties
- Divisors (3)
- 1, 17, 289
- Prime factorisation
- 17^2
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 289
- Scientific notation
- 2.890 × 10^2
Roman numerals
C C L X X X I X
CCLXXXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 0 1 0 0 0 0 1
1 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 289
Octal
4 4 1
4 × 64 + 4 × 8 + 1 × 1 = 289
Hexadecimal
1 2 1
1 × 256 + 2 × 16 + 1 × 1 = 289
Read as powers of two: 256 + 32 + 1 = 289.
In historical numeral systems
Egyptian
2 coils of rope, 8 hobbles, 9 strokes
2 × 100 + 8 × 10 + 9 × 1 = 289. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 vertical wedges (sixties place), 4 corner wedges + 9 vertical wedges (units place)
4 × 60 + 49 = 289. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then pi, then theta, marked as a numeral
sigma-pi-theta + keraia
sigma + pi + theta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
resh, then pe, then tet
resh-pe-tet
resh (200) + pe (80) + tet (9) = 289, written in descending order.
Maya
2 bars + 4 dots (upper, twenties place) over 1 bar + 4 dots (lower, units place)
14 × 20 + 9 = 289. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
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
- Powerful number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
The smallest and largest Ford V8 displacements of the era bracket what the same manufacturer built.
View 460 →Technology & computing
The Ford 289 cubic inch V8 powered early Mustangs and Shelby Cobras. Its light, compact construction relative to contemporary V8s was central to those applications.
DocumentedTechnology & computingGeography: United StatesPeriod: 1963–1968
Common questions
Is 289 a prime number?
No, 289 is not prime.
What are the factors of 289?
The factors of 289 are 1, 17, 289.
What is 289 in Roman numerals?
289 in Roman numerals is CCLXXXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be CCLXXXVIIII, 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