8601
ISO 8601 is the international standard for writing dates and times.
- Odd
- Composite
Where 8601 fits
Why 8601 is special
It specifies year-month-day in descending order of significance, which is the only format that sorts correctly as plain text and cannot be misread between American and European conventions. 2026-07-30 is unambiguous; 07/30/2026 and 30/07/2026 are not.
Factors & digit properties
- Divisors (8)
- 1, 3, 47, 61, 141, 183, 2867, 8601
- Prime factorisation
- 3 × 47 × 61
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 8601
- Scientific notation
- 8.601 × 10^3
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 0 0 0 0 1 1 0 0 1 1 0 0 1
1 × 8,192 + 0 × 4,096 + 0 × 2,048 + 0 × 1,024 + 0 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 8,601
Octal
2 0 6 3 1
2 × 4,096 + 0 × 512 + 6 × 64 + 3 × 8 + 1 × 1 = 8,601
Hexadecimal
2 1 9 9
2 × 4,096 + 1 × 256 + 9 × 16 + 9 × 1 = 8,601
Read as powers of two: 8,192 + 256 + 128 + 16 + 8 + 1 = 8,601.
In historical numeral systems
Egyptian
8 lotuses, 6 coils of rope, 1 stroke
8 × 1,000 + 6 × 100 + 1 × 1 = 8,601. 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
- Lucky number (mathematical sieve)
Related numbers & connections
Date and time formatting is so widely cited by number that the format is simply called 8601.
RFC 3339 is a constrained profile of ISO 8601 that removes the ambiguous options, which is why APIs cite the RFC rather than the standard.
View 3339 →Numbers Around Us
- appears inStandards issued by an organisation
why?
Strength 0.50, confidence "high".
- appears inNumbers assigned as identifiers
why?
Strength 0.50, confidence "high".
Technology & computing
The ISO standard for writing dates and times is 8601 (worldwide, ISO). Year-month-day, largest unit first, which sorts correctly as text and cannot be misread — 03/04/2026 is March in the United States and April almost everywhere else, and 2026-04-03 is April to everyone.
DocumentedTechnology & computingGeography: worldwide, ISOISO 8601 writes dates in descending order of significance, year first. That is the only common format that sorts correctly as plain text and cannot be misread between American and European conventions: 2026-07-30 is unambiguous where 07/30/2026 and 30/07/2026 are not.
DocumentedTechnology & computing
Common questions
Is 8601 a prime number?
No, 8601 is not prime.
What are the factors of 8601?
The factors of 8601 are 1, 3, 47, 61, 141, 183, 2867, 8601.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026