506503 has 4 divisors (see below), whose sum is σ = 507928. Its totient is φ = 505080.

The previous prime is 506501. The next prime is 506507. The reversal of 506503 is 305605.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 305605 = 5 ⋅61121.

It is a cyclic number.

It is not a de Polignac number, because 506503 - 2¹ = 506501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325 + ... + 1057.

It is an arithmetic number, because the mean of its divisors is an integer number (126982).

2⁵⁰⁶⁵⁰³ is an apocalyptic number.

506503 is a deficient number, since it is larger than the sum of its proper divisors (1425).

506503 is an equidigital number, since it uses as much as digits as its factorization.

506503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 506503 is about 711.6902416080. The cubic root of 506503 is about 79.7126671501.

It can be divided in two parts, 50650 and 3, that added together give a cube (50653 = 37³).

The spelling of 506503 in words is "five hundred six thousand, five hundred three".