520503 has 4 divisors (see below), whose sum is σ = 694008. Its totient is φ = 347000.

The previous prime is 520451. The next prime is 520529. The reversal of 520503 is 305025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520503 - 2¹² = 516407 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86748 + ... + 86753.

It is an arithmetic number, because the mean of its divisors is an integer number (173502).

2⁵²⁰⁵⁰³ is an apocalyptic number.

520503 is a deficient number, since it is larger than the sum of its proper divisors (173505).

520503 is a wasteful number, since it uses less digits than its factorization.

520503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173504.

The product of its (nonzero) digits is 150, while the sum is 15.

The square root of 520503 is about 721.4589385405. The cubic root of 520503 is about 80.4404353423.

Adding to 520503 its reverse (305025), we get a palindrome (825528).

The spelling of 520503 in words is "five hundred twenty thousand, five hundred three".