1,825
1,825 is a composite number, odd, a calendar year.
1,825 (one thousand eight hundred twenty-five) is an odd 4-digit number. It is a composite number with 6 divisors, and factors as 5² × 73. Written other ways, in Roman numerals it is MDCCCXXV and in binary, 11100100001.
Interestingness
Notable events — 1825 AD
- Mar 4 John Quincy Adams is inaugurated US president.
- Oct 26 The Erie Canal opens, linking the Great Lakes to the Atlantic.
- Dec 14 The Decembrist revolt against Tsar Nicholas I is suppressed.
- Sep 27 George Stephenson's Locomotion No. 1 opens the Stockton and Darlington Railway.
- Aug 25 Uruguay declares independence from Brazil.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
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, 1825
- Ended on
-
Saturday
December 31, 1825
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 3
Sunday, April 3, 1825
- Decade
-
1820s
1820–1829
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
201
201 years before 2026.
In other calendars
- Hebrew
-
5585 / 5586 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1240 / 1241 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2368 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1203 / 1204 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1817 / 1818 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1747 / 1746 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 2 × 73
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,825 = [42; (1, 2, 1, 1, 2, 1, 84)]
Period length 7 — the block in parentheses repeats forever.
Representations
- In words
- one thousand eight hundred twenty-five
- Ordinal
- 1825th
- Roman numeral
- MDCCCXXV
- Binary
- 11100100001
- Octal
- 3441
- Hexadecimal
- 0x721
- Base64
- ByE=
- One's complement
- 63,710 (16-bit)
- Scientific notation
- 1.825 × 10³
- As a duration
- 1,825 s = 30 minutes, 25 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αωκεʹ
- Mayan (base 20)
- 𝋤·𝋫·𝋥
- Chinese
- 一千八百二十五
- Chinese (financial)
- 壹仟捌佰貳拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,825 = 3
- e — Euler's number (e)
- Digit 1,825 = 3
- φ — Golden ratio (φ)
- Digit 1,825 = 1
- √2 — Pythagoras's (√2)
- Digit 1,825 = 7
- ln 2 — Natural log of 2
- Digit 1,825 = 3
- γ — Euler-Mascheroni (γ)
- Digit 1,825 = 6
Also seen as
UTF-8 encoding: DC A1 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.33.
- Address
- 0.0.7.33
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.33
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,825 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A♯6 (1864.7 Hz, -37¢)
- Scientific pitch (C4 = 256 Hz): A♯6 (1824.6 Hz, exact)
- Baroque pitch (A4 = 415 Hz): B6 (1863.3 Hz, -36¢)
The digit sequence 1825 first appears in π at position 3,082 of the decimal expansion (the 3,082ordinal-suffix:nd digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.