553 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 355 = 5 ⋅71.
It is a cyclic number.
It is the 24-th Hogben number.
It is a Duffinian number.
553 is a lucky number.
It is a plaindrome in base 13, base 15 and base 16.
It is a nialpdrome in base 10.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 553.
It is an amenable number.
553 is an equidigital number, since it uses as much as digits as its factorization.
553 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 86.
The square root of 553 is about 23.5159520326. The cubic root of 553 is about 8.2080824532.