995
Port 995 carries POP3 over TLS — encrypted mail download.
- Odd
- Composite
Where 995 fits
Why 995 is special
995 is the encrypted form of the older download-and-delete mail model. It persists mainly where mail must be pulled off a server and stored locally, which is a shrinking but genuine use rather than pure legacy.
Factors & digit properties
- Divisors (4)
- 1, 5, 199, 995
- Prime factorisation
- 5 × 199
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 995
- Scientific notation
- 9.950 × 10^2
Roman numerals
C M X C V
CMXCV uses the subtractive pair XC: ten before a hundred — a hundred minus ten.
Binary
1 1 1 1 1 0 0 0 1 1
1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 995
Octal
1 7 4 3
1 × 512 + 7 × 64 + 4 × 8 + 3 × 1 = 995
Hexadecimal
3 e 3
3 × 256 + e × 16 + 3 × 1 = 995
Read as powers of two: 512 + 256 + 128 + 64 + 32 + 2 + 1 = 995.
In historical numeral systems
Egyptian
9 coils of rope, 9 hobbles, 5 strokes
9 × 100 + 9 × 10 + 5 × 1 = 995. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 6 vertical wedges (sixties place), 3 corner wedges + 5 vertical wedges (units place)
16 × 60 + 35 = 995. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sampi, then koppa, then epsilon, marked as a numeral
sampi-koppa-epsilon + keraia
sampi + koppa + epsilon 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 tsadi, then he
tav-tav-qof-tsadi-he
tav (400) + tav (400) + qof (100) + tsadi (90) + he (5) = 995, 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
- 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 143 →Other connections
- contrasts with143
why?
Strength 0.50, confidence "high".
Technology & computing
995 carries POP3 over TLS, the download-and-delete approach to mail. It survives where messages genuinely need to be pulled off a server and kept locally, which is a narrow but real use rather than pure legacy.
DocumentedTechnology & computing
Common questions
Is 995 a prime number?
No, 995 is not prime.
What are the factors of 995?
The factors of 995 are 1, 5, 199, 995.
What is 995 in Roman numerals?
995 in Roman numerals is CMXCV. XC is subtractive: ten before a hundred — a hundred minus ten. Written additively it would be DCCCCLXXXXV, 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