520200521 has 8 divisors (see below), whose sum is σ = 538696200. Its totient is φ = 501742080.

The previous prime is 520200511. The next prime is 520200523. The reversal of 520200521 is 125002025.

It can be written as a sum of positive squares in 4 ways, for example, as 7812025 + 512388496 = 2795^2 + 22636^2 .

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 520200521 - 2²² = 516006217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520200521.

It is not an unprimeable number, because it can be changed into a prime (520200523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20825 + ... + 38393.

It is an arithmetic number, because the mean of its divisors is an integer number (67337025).

Almost surely, 2^520200521 is an apocalyptic number.

It is an amenable number.

520200521 is a deficient number, since it is larger than the sum of its proper divisors (18495679).

520200521 is a wasteful number, since it uses less digits than its factorization.

520200521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18619.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 520200521 is about 22807.9047919795. The cubic root of 520200521 is about 804.2485025305.

Adding to 520200521 its reverse (125002025), we get a palindrome (645202546).

The spelling of 520200521 in words is "five hundred twenty million, two hundred thousand, five hundred twenty-one".