521433564 has 12 divisors (see below), whose sum is σ = 1216678344. Its totient is φ = 173811184.

The previous prime is 521433559. The next prime is 521433589. The reversal of 521433564 is 465334125.

It is a tau number, because it is divible by the number of its divisors (12).

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, 21726387 + ... + 21726410.

It is an arithmetic number, because the mean of its divisors is an integer number (101389862).

Almost surely, 2^521433564 is an apocalyptic number.

It is an amenable number.

521433564 is an abundant number, since it is smaller than the sum of its proper divisors (695244780).

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

521433564 is a wasteful number, since it uses less digits than its factorization.

521433564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43452804 (or 43452802 counting only the distinct ones).

The product of its digits is 43200, while the sum is 33.

The square root of 521433564 is about 22834.9198378273. The cubic root of 521433564 is about 804.8834438965.

Adding to 521433564 its reverse (465334125), we get a palindrome (986767689).

The spelling of 521433564 in words is "five hundred twenty-one million, four hundred thirty-three thousand, five hundred sixty-four".