652240521 has 9 divisors (see below), whose sum is σ = 942235879. Its totient is φ = 434775936.

The previous prime is 652240481. The next prime is 652240529. The reversal of 652240521 is 125042256.

The square root of 652240521 is 25539.

It is a perfect power (a square), and thus also a powerful number.

652240521 is a `hidden beast` number, since 652 + 2 + 4 + 0 + 5 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 637310025 + 14930496 = 25245^2 + 3864^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-652240521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (652240529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 72361 + ... + 80873.

Almost surely, 2^652240521 is an apocalyptic number.

652240521 is the 25539-th square number.

652240521 is the 12770-th centered octagonal number.

It is an amenable number.

652240521 is a deficient number, since it is larger than the sum of its proper divisors (289995358).

652240521 is an frugal number, since it uses more digits than its factorization.

652240521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17032 (or 8516 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The cubic root of 652240521 is about 867.2332597952.

Adding to 652240521 its reverse (125042256), we get a palindrome (777282777).

The spelling of 652240521 in words is "six hundred fifty-two million, two hundred forty thousand, five hundred twenty-one".