2,011
2,011 is a prime, odd, a calendar year.
Notable events — 2011 AD
- Feb 11 Hosni Mubarak resigns as President of Egypt amid the Arab Spring uprising.
- Mar 11 A magnitude 9.1 earthquake and tsunami strike Japan, triggering the Fukushima nuclear disaster.
- Apr 29 Prince William and Catherine Middleton marry at Westminster Abbey.
- May 1 US Navy SEALs kill Osama bin Laden in Abbottabad, Pakistan.
- Jul 9 South Sudan declares independence from Sudan.
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, 2011
- Ended on
-
Saturday
December 31, 2011
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 24
Sunday, April 24, 2011
- Decade
-
2010s
2010–2019
- Century
-
21st century
2001–2100
- Millennium
-
3rd millennium
2001–3000
- Years ago
-
15
15 years before 2026.
In other calendars
- Hebrew
-
5771 / 5772 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1432 / 1433 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Rabbit
Sexagenary cycle position 28 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2554 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1389 / 1390 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
2003 / 2004 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1933 / 1932 Saka
Indian national calendar; year starts in March.
- Japanese
-
Heisei 23
Reign-era counting from the start of each emperor's reign.
Properties
Primality
2,011 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- two thousand eleven
- Ordinal
- 2011th
- Roman numeral
- MMXI
- Binary
- 11111011011
- Octal
- 3733
- Hexadecimal
- 0x7DB
- Base64
- B9s=
- One's complement
- 63,524 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓎆𓏺
- Greek (Milesian)
- ͵βιαʹ
- Mayan (base 20)
- 𝋥·𝋠·𝋫
- Chinese
- 二千零一十一
- Chinese (financial)
- 貳仟零壹拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 2,011 = 8
- e — Euler's number (e)
- Digit 2,011 = 7
- φ — Golden ratio (φ)
- Digit 2,011 = 3
- √2 — Pythagoras's (√2)
- Digit 2,011 = 1
- ln 2 — Natural log of 2
- Digit 2,011 = 3
- γ — Euler-Mascheroni (γ)
- Digit 2,011 = 1
Also seen as
UTF-8 encoding: DF 9B (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.219.
- Address
- 0.0.7.219
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.219
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.
The digit sequence 2011 first appears in π at position 5,774 of the decimal expansion (the 5,774ordinal-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.