185
185 is a composite number, odd, a calendar year.
185 (one hundred eighty-five) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 5 × 37. Written other ways, in Roman numerals it is CLXXXV and in binary, 10111001.
Interestingness
Historical context — 185 AD
Calendar year
Year 185 (CLXXXV) was a common year starting on Friday of the Julian calendar.
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Historical context — 185 BC
Calendar year
Year 185 BC was a year of the pre-Julian Roman calendar.
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Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
- 52
- Started on
-
Saturday
January 1, 185
- Ended on
-
Saturday
December 31, 185
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
180s
180–189
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,841
1841 years before 2026.
In other calendars
- Hebrew
-
3945 / 3946 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Wood zodiac:Ox
Sexagenary cycle position 2 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
728 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
177 / 178 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
107 / 106 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 37
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√185 = [13; (1, 1, 1, 1, 26)]
Period length 5 — the block in parentheses repeats forever.
Representations
- In words
- one hundred eighty-five
- Ordinal
- 185th
- Roman numeral
- CLXXXV
- Binary
- 10111001
- Octal
- 271
- Hexadecimal
- 0xB9
- Base64
- uQ==
- One's complement
- 70 (8-bit)
- Scientific notation
- 1.85 × 10²
- As a duration
- 185 s = 3 minutes, 5 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ρπεʹ
- Mayan (base 20)
- 𝋩·𝋥
- Chinese
- 一百八十五
- Chinese (financial)
- 壹佰捌拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 185 = 6
- e — Euler's number (e)
- Digit 185 = 8
- φ — Golden ratio (φ)
- Digit 185 = 6
- √2 — Pythagoras's (√2)
- Digit 185 = 5
- ln 2 — Natural log of 2
- Digit 185 = 6
- γ — Euler-Mascheroni (γ)
- Digit 185 = 7
Also seen as
UTF-8 encoding: C2 B9 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.185.
- Address
- 0.0.0.185
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.185
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 185 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F♯3 (185 Hz, exact)
- Scientific pitch (C4 = 256 Hz): F♯3 (181 Hz, +38¢)
- Baroque pitch (A4 = 415 Hz): G3 (184.9 Hz, +1¢)
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.