8520257 has 4 divisors (see below), whose sum is σ = 8795136. Its totient is φ = 8245380.

The previous prime is 8520241. The next prime is 8520269. The reversal of 8520257 is 7520258.

8520257 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 8520257 - 2⁴ = 8520241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8520157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137393 + ... + 137454.

It is an arithmetic number, because the mean of its divisors is an integer number (2198784).

Almost surely, 2^8520257 is an apocalyptic number.

It is an amenable number.

8520257 is a deficient number, since it is larger than the sum of its proper divisors (274879).

8520257 is a wasteful number, since it uses less digits than its factorization.

8520257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274878.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 8520257 is about 2918.9479269079. The cubic root of 8520257 is about 204.2447482179.

Subtracting from 8520257 its reverse (7520258), we obtain a palindrome (999999).

The spelling of 8520257 in words is "eight million, five hundred twenty thousand, two hundred fifty-seven".