520059509 has 4 divisors (see below), whose sum is σ = 542670816. Its totient is φ = 497448204.

The previous prime is 520059493. The next prime is 520059577. The reversal of 520059509 is 905950025.

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.

It is a cyclic number.

It is not a de Polignac number, because 520059509 - 2⁴ = 520059493 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 (520053509) 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, 11305619 + ... + 11305664.

It is an arithmetic number, because the mean of its divisors is an integer number (135667704).

Almost surely, 2^520059509 is an apocalyptic number.

It is an amenable number.

520059509 is a deficient number, since it is larger than the sum of its proper divisors (22611307).

520059509 is a wasteful number, since it uses less digits than its factorization.

520059509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22611306.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 520059509 is about 22804.8132857956. The cubic root of 520059509 is about 804.1758261079.

The spelling of 520059509 in words is "five hundred twenty million, fifty-nine thousand, five hundred nine".