521551564 has 12 divisors (see below), whose sum is σ = 942157888. Its totient is φ = 252363600.

The previous prime is 521551561. The next prime is 521551571. The reversal of 521551564 is 465155125.

It is not an unprimeable number, because it can be changed into a prime (521551561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2102907 + ... + 2103154.

Almost surely, 2^521551564 is an apocalyptic number.

It is an amenable number.

521551564 is a deficient number, since it is larger than the sum of its proper divisors (420606324).

521551564 is a wasteful number, since it uses less digits than its factorization.

521551564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4206096 (or 4206094 counting only the distinct ones).

The product of its digits is 30000, while the sum is 34.

The square root of 521551564 is about 22837.5034537491. The cubic root of 521551564 is about 804.9441541444.

The spelling of 521551564 in words is "five hundred twenty-one million, five hundred fifty-one thousand, five hundred sixty-four".