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49 (forty-nine) is the natural number following 48 and preceding 50.

Template:Numbers 40s
Cardinal	49 forty-nine
Ordinal	49th forty-ninth
Factorization	${\displaystyle 7^{2}\,\!}$
Divisors	1, 7, 49
Roman numeral	XLIX
Binary	0110001
Hexadecimal	31

In mathematics

Forty-nine is the square of 7, It is a centered octagonal number, and a Somer pseudoprime based on 8.

49 as a primal square is the second number with an aliquot sum of 8; the first being 10, and is the 9th member of the 7-aliquot tree

It appears in the Padovan sequence, preceded by the terms 21, 28, 37 (it is the sum of the first two of these).

In science

• The atomic number of indium

Astronomy

• Messier object M49, a magnitude 10.0 galaxy in the constellation Virgo.

• The New General Catalogue object NGC 49, a spiral galaxy in the constellation Cetus.

• The Saros number of the solar eclipse series which began on -1248 February 22 and ended on 32 March 29. The duration of Saros series 49 was 1280.1 years, and it contained 72 solar eclipses.

• The Saros number of the lunar eclipse series which began on -1217 June 21 and ended on 81 August 8. The duration of Saros series 49 was 1298.1 years, and it contained 73 lunar eclipses.

In religion

• On the Hebrew calendar, the number of days of the Counting of the Omer
• The number of days and night Siddhartha Gautama spent meditating as a holy man
• In the same year the King James Version of the Bible was written, William Shakespeare was believed to be 49. In Psalm 49, the 49th word from the beginning is Shake, and the 49th word from the end is Spear.

In other fields

Forty-nine is:

• The number of strings on a harp and the number of keys on a celesta
• I-49 is the designation for a US interstate highway in Louisiana
• The code for international direct dial phone calls to Germany
• In the title of Thomas Pynchon's novel The Crying of Lot 49
• In the title of the movie Ladder 49
• In the title of the movie 49 Up
• Funk #49, the title of a hit song by the James Gang
• Featured in the song title "49 Bye-Byes" in Crosby Stills and Nash's self-titled album
• Song: 'Days of 49” by Bob Dylan
• A 49 is a term used to describe a party after a Powwow usually held by the powwow dancers
• 49th State: Alaska
• NBC's "Today Show" Studio are located on 49th Street at Rockefeller Plaza
• New York’s Waldorf-Astoria Hotel is on 49th St. and Park Avenue
• At age 49, former PTL minister, Jim Bakker, sent to prison on fraud/tax evasion charges (1989)
• Roman numeral: XLIX
• Ernest Hemingway collection: The Fifth Column and The First Forty-Nine Stories

Sports

• '49er, the moniker of one who participated in the 1849 California Gold Rush, as well as the NFL's San Francisco 49ers
• Astros Larry Dierker's retired uniform #49
• New York Yankees Ron Guidry’s retired uniform #49
• 49 is also a popular uniform number among baseball pitchers who specialize in throwing the knuckleball.
• Heavyweight boxer Rocky Marciano retired with a 49 -0 record (43 KOs)
• Bexley football player Zak Kolada wears the number 49

Historical years

• 49 A.D., 49 B.C., 1949, 2049, etc.

ru-sib:49 (число)

• Integers