652556521 has 8 divisors (see below), whose sum is σ = 675347400. Its totient is φ = 629784960.

The previous prime is 652556497. The next prime is 652556537. The reversal of 652556521 is 125655256.

It can be written as a sum of positive squares in 4 ways, for example, as 290225296 + 362331225 = 17036^2 + 19035^2 .

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 652556521 - 2²⁵ = 619002089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (652556561) 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, 112861 + ... + 118501.

It is an arithmetic number, because the mean of its divisors is an integer number (84418425).

Almost surely, 2^652556521 is an apocalyptic number.

It is an amenable number.

652556521 is a deficient number, since it is larger than the sum of its proper divisors (22790879).

652556521 is a wasteful number, since it uses less digits than its factorization.

652556521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9659.

The product of its digits is 90000, while the sum is 37.

The square root of 652556521 is about 25545.1858673998. The cubic root of 652556521 is about 867.3732906868.

The spelling of 652556521 in words is "six hundred fifty-two million, five hundred fifty-six thousand, five hundred twenty-one".