5503

5503 is a prime number.

5501 and 5503 form a twin prime pair.

5503 is 1111333 in base 4 (A045132).

5503 is a prime whose base 7 representation (22021) also is the base 3 representation of a prime (223) (A235470).

5503 is a member of the Fibonacci-like sequence beginning with 1 and 23 (A022393).

The cube of 5503 contains each of the digits from 1 to 9 but not 0 (A124628): 5503³ = 166,647,398,527.

Source: OEIS