520509 has 8 divisors (see below), whose sum is σ = 757152. Its totient is φ = 315440.

The previous prime is 520451. The next prime is 520529. The reversal of 520509 is 905025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520509 - 2⁷ = 520381 is a prime.

520509 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520529) 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 7 ways as a sum of consecutive naturals, for example, 7854 + ... + 7919.

It is an arithmetic number, because the mean of its divisors is an integer number (94644).

2⁵²⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

520509 is a deficient number, since it is larger than the sum of its proper divisors (236643).

520509 is a wasteful number, since it uses less digits than its factorization.

520509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15787.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 520509 is about 721.4630967693. The cubic root of 520509 is about 80.4407444285.

The spelling of 520509 in words is "five hundred twenty thousand, five hundred nine".