8520013 has 4 divisors (see below), whose sum is σ = 8664480. Its totient is φ = 8375548.

The previous prime is 8520011. The next prime is 8520023. The reversal of 8520013 is 3100258.

It is a happy number.

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 8520013 - 2¹ = 8520011 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520011) 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, 72145 + ... + 72262.

It is an arithmetic number, because the mean of its divisors is an integer number (2166120).

Almost surely, 2^8520013 is an apocalyptic number.

It is an amenable number.

8520013 is a deficient number, since it is larger than the sum of its proper divisors (144467).

8520013 is a wasteful number, since it uses less digits than its factorization.

8520013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144466.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 8520013 is about 2918.9061307277. The cubic root of 8520013 is about 204.2427985038.

The spelling of 8520013 in words is "eight million, five hundred twenty thousand, thirteen".