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For the year A.D. 49, see 49.

Forty-nine (49, XLIX) is the natural number following forty-eight and preceeding fifty. Its divisors are 1, 7, and 49; its factorisation is

${\displaystyle 49=7^{2}}$

It is a Somer pseudoprime based on 8.

Forty-nine 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.
• The code for international direct dial phone calls to Germany.
• As in 49er, the moniker of those who participated in the 1849 gold rush.