520435509 has 32 divisors (see below), whose sum is σ = 779563008. Its totient is φ = 306096000.

The previous prime is 520435457. The next prime is 520435523. The reversal of 520435509 is 905534025.

It is not a de Polignac number, because 520435509 - 2¹⁵ = 520402741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 520435509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520435529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284572 + ... + 286394.

It is an arithmetic number, because the mean of its divisors is an integer number (24361344).

Almost surely, 2^520435509 is an apocalyptic number.

It is an amenable number.

520435509 is a deficient number, since it is larger than the sum of its proper divisors (259127499).

520435509 is a wasteful number, since it uses less digits than its factorization.

520435509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 520435509 is about 22813.0556699448. The cubic root of 520435509 is about 804.3695842349.

The spelling of 520435509 in words is "five hundred twenty million, four hundred thirty-five thousand, five hundred nine".