652428521 has 4 divisors (see below), whose sum is σ = 661365972. Its totient is φ = 643491072.

The previous prime is 652428503. The next prime is 652428523. The reversal of 652428521 is 125824256.

652428521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 121771225 + 530657296 = 11035^2 + 23036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-652428521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (652428523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468616 + ... + 4468761.

It is an arithmetic number, because the mean of its divisors is an integer number (165341493).

Almost surely, 2^652428521 is an apocalyptic number.

It is an amenable number.

652428521 is a deficient number, since it is larger than the sum of its proper divisors (8937451).

652428521 is an equidigital number, since it uses as much as digits as its factorization.

652428521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8937450.

The product of its digits is 38400, while the sum is 35.

The square root of 652428521 is about 25542.6803801011. The cubic root of 652428521 is about 867.3165747613.

The spelling of 652428521 in words is "six hundred fifty-two million, four hundred twenty-eight thousand, five hundred twenty-one".