Number

1,825

1,825 is a composite number, odd, a calendar year.

Deficient Number Happy Number Octagonal Odious Number Pernicious Number Recamán's Sequence Year

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

Parity: Odd
Digit count: 4
Digit sum: 16
Digit product: 80
Digital root: 7
Palindrome: No
Bit width: 11 bits
Reversed: 5,281
Recamán's sequence: a(8,094) = 1,825
Square (n²): 3,330,625
Cube (n³): 6,078,390,625
Divisor count: 6
σ(n) — sum of divisors: 2,294
φ(n) — Euler's totient: 1,440
Sum of prime factors: 83

Primality

Prime factorization: 5 ² × 73

Nearest primes: 1,823 (−2) · 1,831 (+6)

Divisors & multiples

All divisors (6)

1 · 5 · 25 · 73 · 365 · 1825

Aliquot sum (sum of proper divisors): 469

Factor pairs (a × b = 1,825)

1 × 1825

5 × 365

25 × 73

First multiples

1,825 · 3,650 (double) · 5,475 · 7,300 · 9,125 · 10,950 · 12,775 · 14,600 · 16,425 · 18,250

Sums & aliquot sequence

As a sum of two squares: 12² + 41² = 15² + 40² = 23² + 36²

As consecutive integers: 912 + 913 363 + 364 + 365 + 366 + 367 178 + 179 + … + 187 61 + 62 + … + 85

Aliquot sequence: 1,825 → 469 → 75 → 49 → 8 → 7 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 2111121

quaternary (4) 130201

quinary (5) 24300

senary (6) 12241

septenary (7) 5215

nonary (9) 2447

undecimal (11) 140a

duodecimal (12) 1081

tridecimal (13) aa5

tetradecimal (14) 945

pentadecimal (15) 81a

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

In other modern scripts

Eastern Arabic ١٨٢٥ Devanagari १८२५ Bengali ১৮২৫ Tamil ௧௮௨௫ Thai ๑๘๒๕ Tibetan ༡༨༢༥ Khmer ១៨២៥ Lao ໑໘໒໕ Burmese ၁၈၂၅

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

Unicode codepoint

Syriac Letter Mim

U+0721

Other letter (Lo)

UTF-8 encoding: DC A1 (2 bytes).

Lookup U+0721 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000721

RGB(0, 7, 33)

IPv4 address

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.

Position in π

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.

Look up 1825 on Pi Search ↗