Forty-seven is the fifteenth prime number.
A safe prime.
The thirteenth supersingular prime.
The sixth Lucas prime.
Forty-seven is a highly cototient number.
It is an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
47 is the atomic number of silver.
47 is the atomic mass of one of the naturally occurring stable isotopes of titanium.
The Tropic of Cancer and the Tropic of Capricorn are located 47 degrees apart.
There are Forty-seven Ronin in the famous Japanese story.
Messier object M47, a magnitude 4.5 open cluster in the constellation Puppis
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