83 (eighty-three) is the natural number following 82 and preceding 84.
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In mathematics
83 is a Sophie Germain prime, a safe prime, a Chen prime, and an Eisenstein prime with no imaginary part and real part of the form 3n − 1. It is a cousin prime with 79 and a sexy prime with 89. Because 83 is the 23rd prime number and 23 is prime, 83 is a super-prime.
83 is the sum of three consecutive primes (23 + 29 + 31) and the sum of five consecutive primes (11 + 13 + 17 + 19 + 23).
There are 83 primes that are right-truncatable.
83 is a highly cototient number.
In other fields
The eighth letter of the alphabet is H and the third letter is C, thus 83 stands for "Heil Christ," a greeting used by organizations that consider themselves to be Christian. While not necessarily a hate symbol, it is often used by hate organizations. The Anti-Defamation League classifies 83 as a hate symbol.