8520641 has 4 divisors (see below), whose sum is σ = 8528832. Its totient is φ = 8512452.

The previous prime is 8520623. The next prime is 8520647. The reversal of 8520641 is 1460258.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8520641 - 2¹⁰ = 8519617 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8520641.

It is not an unprimeable number, because it can be changed into a prime (8520647) 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 3 ways as a sum of consecutive naturals, for example, 2261 + ... + 4706.

It is an arithmetic number, because the mean of its divisors is an integer number (2132208).

Almost surely, 2^8520641 is an apocalyptic number.

It is an amenable number.

8520641 is a deficient number, since it is larger than the sum of its proper divisors (8191).

8520641 is a wasteful number, since it uses less digits than its factorization.

8520641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 8520641 is about 2919.0137032909. The cubic root of 8520641 is about 204.2478165449.

Adding to 8520641 its reverse (1460258), we get a palindrome (9980899).

The spelling of 8520641 in words is "eight million, five hundred twenty thousand, six hundred forty-one".