143
Port 143 carries IMAP, the protocol for reading mail kept on a server.
- Odd
- Composite
Where 143 fits
Why 143 is special
IMAP's difference from POP3 is that the mail stays on the server, so the same mailbox looks identical from a phone and a laptop. That design is why webmail and multi-device mail feel normal, and why port 143 largely displaced the download-and-delete model.
Factors & digit properties
- Divisors (4)
- 1, 11, 13, 143
- Prime factorisation
- 11 × 13
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 143
- Scientific notation
- 1.430 × 10^2
Roman numerals
C X L I I I
CXLIII uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 0 1 1 1 1
1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 143
Octal
2 1 7
2 × 64 + 1 × 8 + 7 × 1 = 143
Hexadecimal
8 f
8 × 16 + f × 1 = 143
Read as powers of two: 128 + 8 + 4 + 2 + 1 = 143.
In historical numeral systems
Egyptian
1 coil of rope, 4 hobbles, 3 strokes
1 × 100 + 4 × 10 + 3 × 1 = 143. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 vertical wedges (sixties place), 2 corner wedges + 3 vertical wedges (units place)
2 × 60 + 23 = 143. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
rho, then mu, then gamma, marked as a numeral
rho-mu-gamma + keraia
rho + mu + gamma written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
qof, then mem, then gimel
qof-mem-gimel
qof (100) + mem (40) + gimel (3) = 143, written in descending order.
Maya
1 bar + 2 dots (upper, twenties place) over 3 dots (lower, units place)
7 × 20 + 3 = 143. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
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
- Semiprime
Related numbers & connections
IMAP leaves mail on the server so every device sees the same mailbox; POP3 downloads and deletes it. The choice between the two ports is the choice between those models.
View 995 →Other connections
- contrasts with995
why?
Strength 0.50, confidence "high".
Technology & computing
IMAP keeps messages on the server rather than downloading and deleting them, so a mailbox read on a phone and a laptop stays in one state. That design is the reason multi-device mail feels unremarkable, and why 143 displaced the older download model.
DocumentedTechnology & computing
Common questions
Is 143 a prime number?
No, 143 is not prime.
What are the factors of 143?
The factors of 143 are 1, 11, 13, 143.
What is 143 in Roman numerals?
143 in Roman numerals is CXLIII. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be CXXXXIII, 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