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49 is the natural number following 48 and preceding 50.

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

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

It is also:

• The atomic number of indium.
• 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 gold rush.
• The year AD 49, 49 BC, and 1949.
• In the title of the movie Ladder 49

• Integers
• Composite numbers