863
CWE-863 is incorrect authorisation.
- Odd
- Prime
Where 863 fits
Why 863 is special
The check runs and returns the wrong answer, which is harder to find than a missing check because the code plainly looks correct.
863 is part of
Factors & digit properties
- Divisors (2)
- 1, 863
- Prime factorisation
- 863
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 863
- Scientific notation
- 8.630 × 10^2
Roman numerals
D C C C L X I I I
Binary
1 1 0 1 0 1 1 1 1 1
1 × 512 + 1 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 863
Octal
1 5 3 7
1 × 512 + 5 × 64 + 3 × 8 + 7 × 1 = 863
Hexadecimal
3 5 f
3 × 256 + 5 × 16 + f × 1 = 863
Read as powers of two: 512 + 256 + 64 + 16 + 8 + 4 + 2 + 1 = 863.
In historical numeral systems
Egyptian
8 coils of rope, 6 hobbles, 3 strokes
8 × 100 + 6 × 10 + 3 × 1 = 863. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 4 vertical wedges (sixties place), 2 corner wedges + 3 vertical wedges (units place)
14 × 60 + 23 = 863. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
omega, then xi, then gamma, marked as a numeral
omega-xi-gamma + keraia
omega + xi + 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 tav, then samekh, then gimel
tav-tav-samekh-gimel
tav (400) + tav (400) + samekh (60) + gimel (3) = 863, 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
- Happy number
- Safe prime
Related numbers & connections
CWE-862 is no authorisation check and CWE-863 is a check that returns the wrong answer, which is harder to spot in review.
View 862 →Technology & computing
CWE-863 covers authorisation logic that performs a check but reaches an incorrect decision, distinguished from CWE-862, where no check is performed at all.
DocumentedTechnology & computingGeography: International — MITRE CWEPeriod: 2006–
Common questions
Is 863 a prime number?
Yes, 863 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 863?
The factors of 863 are 1, 863.
What is 863 in Roman numerals?
863 in Roman numerals is DCCCLXIII.
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