Numberwise

6809

The 6809 is Motorola's most sophisticated 8-bit processor.

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Where 6809 fits

Where 6809 fits: Mathematics, Related numbersMathematics: Semiprime. Related numbers: 6502, 6800.MathematicsSemiprimeRelated numbers650268006809
6809 connects to 2 worlds: mathematics, related numbers.

Why 6809 is special

Its position-independent addressing made it a favourite for writing operating systems, and it is often described as the best 8-bit design that lost commercially.

Factors & digit properties

Divisors (4)
1, 11, 619, 6809
Prime factorisation
11 × 619
Digit sum
23
Digital root
5

Representations

Decimal
6809
Scientific notation
6.809 × 10^3

Roman numerals

Roman numerals as modelled here goes up to 3,999.

Binary

1 1 0 1 0 1 0 0 1 1 0 0 1

1 × 4,096 + 1 × 2,048 + 0 × 1,024 + 1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 6,809

Octal

1 5 2 3 1

1 × 4,096 + 5 × 512 + 2 × 64 + 3 × 8 + 1 × 1 = 6,809

Hexadecimal

1 a 9 9

1 × 4,096 + a × 256 + 9 × 16 + 9 × 1 = 6,809

Read as powers of two: 4,096 + 2,048 + 512 + 128 + 16 + 8 + 1 = 6,809.

In historical numeral systems

Egyptian

6 lotuses, 8 coils of rope, 9 strokes

6 × 1,000 + 8 × 100 + 9 × 1 = 6,809. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.

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

Related numbers & connections

Connection
The 6809 was the more sophisticated 8-bit design and the 6502 the far more successful one, which is a recurring pattern in the industry.

The 6809 was the more sophisticated 8-bit design and the 6502 the far more successful one, which is a recurring pattern in the industry.

View 6502 →

Other connections

  • contrasts with6502
    why?

    Strength 0.50, confidence "high".

  • developed from6800
    why?

    Strength 0.50, confidence "high".

How is 6809 connected to another number? →

Technology & computing

  • The 6809 offers two index registers, two stack pointers and position-independent addressing modes. It was used in the Dragon 32, the TRS-80 Color Computer and Vectrex, but sold far below the 6502 and Z80.

    DocumentedTechnology & computingPeriod: 1978–

Common questions

Is 6809 a prime number?

No, 6809 is not prime.

What are the factors of 6809?

The factors of 6809 are 1, 11, 619, 6809.

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