2616
RFC 2616 defined HTTP/1.1, the version of the web's protocol that ran it for fifteen years.
- Even
- Composite
Where 2616 fits
Why 2616 is special
Published in 1999 and formally replaced in 2014, RFC 2616 is still the number developers cite. Its replacement split the same material across six documents precisely because one 176-page specification had accumulated ambiguities that implementers resolved differently.
Not just a mathematical number
2616is also used in ways where ordinary arithmetic doesn't apply — each listed below with what genuinely does and doesn't follow from it.
- Mathematical number
A genuine quantity — its mathematical properties (prime, square, factors, and so on) are real facts about it.
A genuine quantity that ordinary arithmetic applies to — it can be prime, even, a perfect square, added to another number meaningfully, and so on.
- Code
Also used as a code — HTTP status codes.
An assigned identifier from a fixed registry or standard — its digits don't represent an amount, and arithmetic on it is meaningless (HTTP status 404 + 1 is not a 'better' status; it's a different, unrelated code).
Factors & digit properties
- Divisors (16)
- 1, 2, 3, 4, 6, 8, 12, 24, 109, 218, 327, 436, 654, 872, 1308, 2616
- Prime factorisation
- 2^3 × 3 × 109
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 2616
- Scientific notation
- 2.616 × 10^3
Roman numerals
M M D C X V I
Binary
1 0 1 0 0 0 1 1 1 0 0 0
1 × 2,048 + 0 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 2,616
Octal
5 0 7 0
5 × 512 + 0 × 64 + 7 × 8 + 0 × 1 = 2,616
Hexadecimal
a 3 8
a × 256 + 3 × 16 + 8 × 1 = 2,616
Read as powers of two: 2,048 + 512 + 32 + 16 + 8 = 2,616.
In historical numeral systems
Egyptian
2 lotuses, 6 coils of rope, 1 hobble, 6 strokes
2 × 1,000 + 6 × 100 + 1 × 10 + 6 × 1 = 2,616. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges + 3 vertical wedges (sixties place), 3 corner wedges + 6 vertical wedges (units place)
43 × 60 + 36 = 2616. Places are separated by a space on the tablet, with the higher place written first.
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
- Abundant number
Related numbers & connections
RFC 2616 is the number by which HTTP/1.1 was cited for fifteen years, long after the document itself was split and replaced.
RFC 2616 was split into six documents because one specification covering all of HTTP had become impossible to implement correctly from.
View 7230 →Numbers Around Us
- appears inNumbers assigned as identifiers
why?
Strength 0.50, confidence "high".
- appears inHTTP status codes
why?
Strength 0.50, confidence "high".
Other connections
- developed from7230
why?
Strength 0.50, confidence "high".
- developed from7540
why?
Strength 0.50, confidence "high".
- is associated with6265
why?
Strength 0.50, confidence "high".
- is associated with404
why?
Strength 0.50, confidence "high".
- developed from6455
why?
Strength 0.50, confidence "high".
- developed from7231
why?
Strength 0.50, confidence "high".
- developed from2068
why?
Strength 0.50, confidence "high".
Technology & computing
RFC 2616 defined HTTP/1.1 in 1999 and remained the number developers cited long after it was formally replaced in 2014. Its successor split the same material across six documents specifically because a single 176-page specification had accumulated ambiguities that implementers resolved in incompatible ways.
DocumentedTechnology & computing
Common questions
Is 2616 a prime number?
No, 2616 is not prime.
What are the factors of 2616?
The factors of 2616 are 1, 2, 3, 4, 6, 8, 12, 24, 109, 218, 327, 436, 654, 872, 1308, 2616.
What is 2616 in Roman numerals?
2616 in Roman numerals is MMDCXVI.
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