520903 has 4 divisors (see below), whose sum is σ = 524088. Its totient is φ = 517720.

The previous prime is 520889. The next prime is 520913. The reversal of 520903 is 309025.

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 520903 - 2¹³ = 512711 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 (520913) 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, 1333 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (131022).

2⁵²⁰⁹⁰³ is an apocalyptic number.

520903 is a deficient number, since it is larger than the sum of its proper divisors (3185).

520903 is a wasteful number, since it uses less digits than its factorization.

520903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3184.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 520903 is about 721.7361013556. The cubic root of 520903 is about 80.4610358866.

Adding to 520903 its reverse (309025), we get a palindrome (829928).

The spelling of 520903 in words is "five hundred twenty thousand, nine hundred three".