521000520 has 64 divisors (see below), whose sum is σ = 1645272000. Its totient is φ = 131620608.

The previous prime is 521000461. The next prime is 521000527. The reversal of 521000520 is 25000125.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 521000520.

It is not an unprimeable number, because it can be changed into a prime (521000527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111975 + ... + 116534.

It is an arithmetic number, because the mean of its divisors is an integer number (25707375).

Almost surely, 2^521000520 is an apocalyptic number.

It is an amenable number.

521000520 is an abundant number, since it is smaller than the sum of its proper divisors (1124271480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521000520 is a wasteful number, since it uses less digits than its factorization.

521000520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228542 (or 228538 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 521000520 is about 22825.4358118306. The cubic root of 521000520 is about 804.6605670025.

Adding to 521000520 its reverse (25000125), we get a palindrome (546000645).

The spelling of 521000520 in words is "five hundred twenty-one million, five hundred twenty", and thus it is an aban number.