• 832 = 6889 is the smallest square that contains exactly two digits '8'.
Adding to 83 its reverse (38), we get a palindrome (121).
Subtracting from 83 its reverse (38), we obtain a triangular number (45 = T9).
83 is nontrivially palindromic in base 5.
83 is an esthetic number in base 8, base 11 and base 13, because in such bases its adjacent digits differ by 1.
It is a weak prime.
83 is a truncatable prime.
It is a cyclic number.
It is a Sophie Germain prime.
It is a Chen prime.
It is a magnanimous number.
It is an alternating number because its digits alternate between even and odd.
83 is an undulating number in base 5.
It is a plaindrome in base 7, base 8, base 12, base 14 and base 15.
It is a nialpdrome in base 10, base 11, base 13 and base 16.
83 is an equidigital number, since it uses as much as digits as its factorization.
83 is an evil number, because the sum of its binary digits is even.
The square root of 83 is about 9.1104335791. The cubic root of 83 is about 4.3620706715.