It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-2503 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is a self number, because there is not a number n which added to its sum of digits gives 2503.
It is a congruent number.
2503 is a Friedman number, since it can be written as 50^2+3, using all its digits and the basic arithmetic operations.
2503 is an equidigital number, since it uses as much as digits as its factorization.
2503 is an odious number, because the sum of its binary digits is odd.
The square root of 2503 is about 50.0299910054. The cubic root of 2503 is about 13.5775147481.
Adding to 2503 its reverse (3052), we get a palindrome (5555).
The spelling of 2503 in words is "two thousand, five hundred three".