520536565 has 4 divisors (see below), whose sum is σ = 624643884. Its totient is φ = 416429248.

The previous prime is 520536557. The next prime is 520536581. The reversal of 520536565 is 565635025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 111809476 + 408727089 = 10574^2 + 20217^2 .

It is a cyclic number.

It is not a de Polignac number, because 520536565 - 2³ = 520536557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52053652 + ... + 52053661.

It is an arithmetic number, because the mean of its divisors is an integer number (156160971).

Almost surely, 2^520536565 is an apocalyptic number.

It is an amenable number.

520536565 is a deficient number, since it is larger than the sum of its proper divisors (104107319).

520536565 is a wasteful number, since it uses less digits than its factorization.

520536565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104107318.

The product of its (nonzero) digits is 135000, while the sum is 37.

The square root of 520536565 is about 22815.2704345138. The cubic root of 520536565 is about 804.4216439110.

The spelling of 520536565 in words is "five hundred twenty million, five hundred thirty-six thousand, five hundred sixty-five".