Number
1,909
1,909 is a composite number, odd, a calendar year.
Notable events — 1909 AD
- Feb 12 The NAACP is founded in New York.
- Apr 6 Robert Peary's expedition claims to have reached the North Pole.
- Jul 25 Louis Blériot makes the first heavier-than-air crossing of the English Channel.
- Aug 2 The US Army purchases the Wright Military Flyer, its first military aircraft.
- Oct 26 Itō Hirobumi, Japan's former PM and resident-general of Korea, is assassinated in Harbin.
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
-
Friday
January 1, 1909
- Ended on
-
Friday
December 31, 1909
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 11
Sunday, April 11, 1909
- Decade
-
1900s
1900–1909
- Century
-
20th century
1901–2000
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
117
117 years before 2026.
In other calendars
- Hebrew
-
5669 / 5670 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1326 / 1327 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Rooster
Sexagenary cycle position 46 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2452 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1287 / 1288 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1901 / 1902 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1831 / 1830 Saka
Indian national calendar; year starts in March.
- Japanese
-
Meiji 42
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 19
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 9,091
- Flips to (rotate 180°)
- 6,061
- Recamán's sequence
- a(7,926) = 1,909
- Square (n²)
- 3,644,281
- Cube (n³)
- 6,956,932,429
- Divisor count
- 4
- σ(n) — sum of divisors
- 2,016
- φ(n) — Euler's totient
- 1,804
- Sum of prime factors
- 106
Primality
Prime factorization: 23 × 83
Divisors & multiples
Aliquot sum (sum of proper divisors):
107
First multiples
Sums & aliquot sequence
As consecutive integers:
954 + 955
72 + 73 + … + 94
19 + 20 + … + 64
Aliquot sequence:
1,909 → 107 → 1 → 0
— terminates at zero
Representations
- In words
- one thousand nine hundred nine
- Ordinal
- 1909th
- Roman numeral
- MCMIX
- Binary
- 11101110101
- Octal
- 3565
- Hexadecimal
- 0x775
- Base64
- B3U=
- One's complement
- 63,626 (16-bit)
In other bases
ternary (3)
2121201
quaternary (4)
131311
quinary (5)
30114
senary (6)
12501
septenary (7)
5365
nonary (9)
2551
undecimal (11)
1486
duodecimal (12)
1131
tridecimal (13)
b3b
tetradecimal (14)
9a5
pentadecimal (15)
874
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αϡθʹ
- Mayan (base 20)
- 𝋤·𝋯·𝋩
- Chinese
- 一千九百零九
- Chinese (financial)
- 壹仟玖佰零玖
In other modern scripts
Eastern Arabic
١٩٠٩
Devanagari
१९०९
Bengali
১৯০৯
Tamil
௧௯௦௯
Thai
๑๙๐๙
Tibetan
༡༩༠༩
Khmer
១៩០៩
Lao
໑໙໐໙
Burmese
၁၉၀၉
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,909 = 8
- e — Euler's number (e)
- Digit 1,909 = 1
- φ — Golden ratio (φ)
- Digit 1,909 = 9
- √2 — Pythagoras's (√2)
- Digit 1,909 = 6
- ln 2 — Natural log of 2
- Digit 1,909 = 3
- γ — Euler-Mascheroni (γ)
- Digit 1,909 = 3
Also seen as
Unicode codepoint
ݵ
Arabic Letter Farsi Yeh With Extended Arabic-Indic Digit Two Above
U+0775
Other letter (Lo)
UTF-8 encoding: DD B5 (2 bytes).
Hex color
#000775
RGB(0, 7, 117)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.117.
- Address
- 0.0.7.117
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.117
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Position in π
The digit sequence 1909 first appears in π at position 246 of the decimal expansion (the 246ordinal-suffix:th 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.