8507521 has 8 divisors (see below), whose sum is σ = 9532224. Its totient is φ = 7524720.

The previous prime is 8507483. The next prime is 8507537. The reversal of 8507521 is 1257058.

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 8507521 - 2¹¹ = 8505473 is a prime.

It is a Duffinian number.

8507521 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8507521.

It is not an unprimeable number, because it can be changed into a prime (8507561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10045 + ... + 10858.

It is an arithmetic number, because the mean of its divisors is an integer number (1191528).

Almost surely, 2^8507521 is an apocalyptic number.

It is an amenable number.

8507521 is a deficient number, since it is larger than the sum of its proper divisors (1024703).

8507521 is a wasteful number, since it uses less digits than its factorization.

8507521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20951.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 8507521 is about 2916.7655030873. The cubic root of 8507521 is about 204.1429297593.

The spelling of 8507521 in words is "eight million, five hundred seven thousand, five hundred twenty-one".