49 is the natural number following 48 and preceding 50.

List of numbers — Integers << 40 41 42 43 44 45 46 47 48 49 >>
Cardinal	forty-nine
Ordinal	49th (forty-ninth)
Factorization	<math>7^2 \,\!<math>
Roman numeral	XLIX
Binary	0110001
Hexadecimal	31

In mathematics

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

In science

• The atomic number of indium

In astronomy,

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

The New General Catalogue object (http://www.ngcic.org/) NGC 49, a [spiral galaxy]] in the constellation Cetus

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) 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 (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) 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 other fields

Forty-nine is also:

• The span between Jubilee years as ordained in the Holy Bible.
• 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.
• As in 49er, the moniker of those who participated in the 1849 California Gold Rush.
• In the title of Thomas Pynchon's novel The Crying of Lot 49.
• In the title of the movie Ladder 49.
• The year AD 49, 49 BC, and 1949.

es:Cuarenta y nueve ia:49 it:Quarantanove ja:49 pt:Quarenta e nove sl:49 (število) sv:49 (tal) zh:49