Numberwise

5681

RFC 5681 specifies TCP congestion control.

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Where 5681 fits

Where 5681 fits: Technology, Related numbersTechnology: Numbers that make the internet work. Related numbers: 8985, 7413, 793, 6298, 6582.TechnologyNumbers that make the inter…Related numbers8985741379362985681
5681 connects to 2 worlds: technology, related numbers.

Why 5681 is special

Slow start, congestion avoidance, fast retransmit and fast recovery are defined here, and they are why the internet did not collapse under load in 1986.

5681 is part of

Internet and web numbersNumbers around us

Factors & digit properties

Divisors (8)
1, 13, 19, 23, 247, 299, 437, 5681
Prime factorisation
13 × 19 × 23
Digit sum
20
Digital root
2

Representations

Decimal
5681
Scientific notation
5.681 × 10^3

Roman numerals

Roman numerals as modelled here goes up to 3,999.

Binary

1 0 1 1 0 0 0 1 1 0 0 0 1

1 × 4,096 + 0 × 2,048 + 1 × 1,024 + 1 × 512 + 0 × 256 + 0 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 5,681

Octal

1 3 0 6 1

1 × 4,096 + 3 × 512 + 0 × 64 + 6 × 8 + 1 × 1 = 5,681

Hexadecimal

1 6 3 1

1 × 4,096 + 6 × 256 + 3 × 16 + 1 × 1 = 5,681

Read as powers of two: 4,096 + 1,024 + 512 + 32 + 16 + 1 = 5,681.

In historical numeral systems

Egyptian

5 lotuses, 6 coils of rope, 8 hobbles, 1 stroke

5 × 1,000 + 6 × 100 + 8 × 10 + 1 × 1 = 5,681. 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

Related numbers & connections

Documented appearance
TCP congestion control is why the internet did not collapse under load in the late 1980s.

TCP congestion control is why the internet did not collapse under load in the late 1980s.

Connection
RACK-TLP infers loss from transmission times rather than duplicate acknowledgement counts.

RACK-TLP infers loss from transmission times rather than duplicate acknowledgement counts.

View 8985 →

Numbers Around Us

  • appears inNumbers that make the internet work
    why?

    Strength 0.50, confidence "high".

Other connections

  • developed from8985
    why?

    Strength 0.50, confidence "high".

  • is associated with7413
    why?

    Strength 0.50, confidence "high".

  • developed from793
    why?

    Strength 0.50, confidence "high".

  • is associated with6298
    why?

    Strength 0.50, confidence "high".

  • developed from6582
    why?

    Strength 0.50, confidence "high".

How is 5681 connected to another number? →

Technology & computing

  • RFC 5681 specifies the standard TCP congestion control algorithms. Their introduction followed the congestion collapse episodes observed on the early internet.

    DocumentedTechnology & computingGeography: International — IETFPeriod: 2009

Common questions

Is 5681 a prime number?

No, 5681 is not prime.

What are the factors of 5681?

The factors of 5681 are 1, 13, 19, 23, 247, 299, 437, 5681.

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