652507521 has 4 divisors (see below), whose sum is σ = 870010032. Its totient is φ = 435005012.

The previous prime is 652507517. The next prime is 652507613. The reversal of 652507521 is 125705256.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 652507521 - 2² = 652507517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (652507021) 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, 108751251 + ... + 108751256.

It is an arithmetic number, because the mean of its divisors is an integer number (217502508).

Almost surely, 2^652507521 is an apocalyptic number.

It is an amenable number.

652507521 is a deficient number, since it is larger than the sum of its proper divisors (217502511).

652507521 is a wasteful number, since it uses less digits than its factorization.

652507521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217502510.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 652507521 is about 25544.2267645744. The cubic root of 652507521 is about 867.3515799978.

It can be divided in two parts, 65250 and 7521, that added together give a triangular number (72771 = T₃₈₁).

The spelling of 652507521 in words is "six hundred fifty-two million, five hundred seven thousand, five hundred twenty-one".