8009
Port 8009 carries the AJP protocol between a web server and Tomcat.
- Odd
- Prime
Where 8009 fits
Why 8009 is special
A 2020 vulnerability named Ghostcat let anyone reaching the port read files from the application. It had been enabled by default for years.
8009 is part of
Factors & digit properties
- Divisors (2)
- 1, 8009
- Prime factorisation
- 8009
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 8009
- Scientific notation
- 8.009 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 1 1 1 1 0 1 0 0 1 0 0 1
1 × 4,096 + 1 × 2,048 + 1 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 8,009
Octal
1 7 5 1 1
1 × 4,096 + 7 × 512 + 5 × 64 + 1 × 8 + 1 × 1 = 8,009
Hexadecimal
1 f 4 9
1 × 4,096 + f × 256 + 4 × 16 + 9 × 1 = 8,009
Read as powers of two: 4,096 + 2,048 + 1,024 + 512 + 256 + 64 + 8 + 1 = 8,009.
In historical numeral systems
Egyptian
8 lotuses, 9 strokes
8 × 1,000 + 9 × 1 = 8,009. 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
- Deficient number
- Twin prime
Related numbers & connections
AJP on 8009 connects a web server to Tomcat and was enabled by default for years, which turned into file disclosure when Ghostcat was published in 2020.
View 8081 →Other connections
- is associated with8081
why?
Strength 0.50, confidence "high".
Technology & computing
AJP on 8009 was enabled by default in Tomcat for years. The 2020 Ghostcat flaw turned that default into file disclosure on any exposed server, and the fix was largely to stop enabling it.
DocumentedTechnology & computingPeriod: 2020
Common questions
Is 8009 a prime number?
Yes, 8009 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 8009?
The factors of 8009 are 1, 8009.
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