Fifty-threeFor the year A.D. 53, see 53.
Fifty-three (53, LIII) is the natural number following fifty-two and preceding fifty-four.
Fifty-three is the 16th smallest prime number. The next is fifty-nine. Fifty-three is also the sum of five consecutive primes (5 + 7 + 11 + 13 + 17).
Fifty-three is also:
- The atomic number of iodine.
- The code for international direct dial phone calls to Cuba.
- In the title of the 1912 movie North of Fifty Three, remade in 1917.
- The number of short poems in the book Rumi Birdsong by Jelaluddin Rumi.