636
Port 636 carries LDAP over TLS.
- Even
- Composite
Where 636 fits
Why 636 is special
636 is to 389 what 443 is to 80. Directory traffic contains usernames, group memberships and organisational structure, so running it unencrypted on 389 inside a corporate network remains one of the most common audit findings.
636 is part of
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 12, 53, 106, 159, 212, 318, 636
- Prime factorisation
- 2^2 × 3 × 53
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 636
- Scientific notation
- 6.360 × 10^2
Roman numerals
D C X X X V I
Binary
1 0 0 1 1 1 1 1 0 0
1 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 0 × 1 = 636
Octal
1 1 7 4
1 × 512 + 1 × 64 + 7 × 8 + 4 × 1 = 636
Hexadecimal
2 7 c
2 × 256 + 7 × 16 + c × 1 = 636
Read as powers of two: 512 + 64 + 32 + 16 + 8 + 4 = 636.
In historical numeral systems
Egyptian
6 coils of rope, 3 hobbles, 6 strokes
6 × 100 + 3 × 10 + 6 × 1 = 636. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge (sixties place), 3 corner wedges + 6 vertical wedges (units place)
10 × 60 + 36 = 636. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then lambda, then stigma, marked as a numeral
chi-lambda-stigma + keraia
chi + lambda + stigma 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 resh, then lamed, then vav
tav-resh-lamed-vav
tav (400) + resh (200) + lamed (30) + vav (6) = 636, 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
- Abundant number
Related numbers & connections
Directory traffic encrypted and in the clear. The pairing repeats across protocols that moved to TLS by adding a second port rather than upgrading the first.
View 389 →Other connections
- is associated with389
why?
Strength 0.50, confidence "high".
Technology & computing
636 carries directory traffic over TLS; 389 carries it in the clear. Because directory queries contain usernames, group memberships and organisational structure, unencrypted LDAP on an internal network remains one of the most persistently reported audit findings in enterprise IT.
DocumentedTechnology & computing
Common questions
Is 636 a prime number?
No, 636 is not prime.
What are the factors of 636?
The factors of 636 are 1, 2, 3, 4, 6, 12, 53, 106, 159, 212, 318, 636.
What is 636 in Roman numerals?
636 in Roman numerals is DCXXXVI.
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