7811
ISO/IEC 7811 defines magnetic stripe recording on cards.
- Odd
- Composite
Where 7811 fits
Why 7811 is special
The three tracks it specifies are why a card swipe carries the account number, the name and a discretionary field, and why cloning a stripe is trivial.
Factors & digit properties
- Divisors (4)
- 1, 73, 107, 7811
- Prime factorisation
- 73 × 107
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 7811
- Binary
- 1111010000011
- Octal
- 17203
- Hexadecimal
- 1e83
- Scientific notation
- 7.811 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
The magnetic stripe holds static unprotected data and the chip performs cryptographic operations, which is why one could be cloned and the other largely cannot.
View 7816 →Other connections
- contrasts with7816
why?
Strength 0.50, confidence "high".
Technology & computing
ISO/IEC 7811 specifies the recording technique and data content of magnetic stripes on identification cards. The stripe holds static data with no cryptographic protection, which chip standards were introduced to address.
DocumentedTechnology & computingGeography: International — ISO member bodiesPeriod: 1985–
Common questions
Is 7811 a prime number?
No, 7811 is not prime.
What are the factors of 7811?
The factors of 7811 are 1, 73, 107, 7811.
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: 3 August 2026