919
RFC 919 defined broadcast addressing.
- Odd
- Prime
Where 919 fits
Why 919 is special
It settled which address means everyone on this network, after implementations had disagreed and produced broadcast storms.
919 is part of
Factors & digit properties
- Divisors (2)
- 1, 919
- Prime factorisation
- 919
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 919
- Scientific notation
- 9.190 × 10^2
Roman numerals
C M X I X
CMXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 1 0 0 1 0 1 1 1
1 × 512 + 1 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 919
Octal
1 6 2 7
1 × 512 + 6 × 64 + 2 × 8 + 7 × 1 = 919
Hexadecimal
3 9 7
3 × 256 + 9 × 16 + 7 × 1 = 919
Read as powers of two: 512 + 256 + 128 + 16 + 4 + 2 + 1 = 919.
In historical numeral systems
Egyptian
9 coils of rope, 1 hobble, 9 strokes
9 × 100 + 1 × 10 + 9 × 1 = 919. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 5 vertical wedges (sixties place), 1 corner wedge + 9 vertical wedges (units place)
15 × 60 + 19 = 919. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sampi, then iota, then theta, marked as a numeral
sampi-iota-theta + keraia
sampi + iota + theta 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 qof, then yod, then tet
tav-tav-qof-yod-tet
tav (400) + tav (400) + qof (100) + yod (10) + tet (9) = 919, 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
- Palindromic number
- Deficient number
Related numbers & connections
One settled what a broadcast address means and the other extended it to subnets, creating the directed broadcast later abused.
View 922 →Numbers Around Us
- appears alongside922
why?
Strength 0.50, confidence "high".
Technology & computing
RFC 919 specified broadcast internet datagrams, resolving inconsistency between implementations using all-zeros and all-ones host parts for broadcast.
DocumentedTechnology & computingGeography: International — IETFPeriod: 1984
Common questions
Is 919 a prime number?
Yes, 919 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 919?
The factors of 919 are 1, 919.
What is 919 in Roman numerals?
919 in Roman numerals is CMXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be DCCCCXVIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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