8245521 has 6 divisors (see below), whose sum is σ = 11910210. Its totient is φ = 5497008.

The previous prime is 8245519. The next prime is 8245547. The reversal of 8245521 is 1255428.

It is a happy number.

8245521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6890625 + 1354896 = 2625^2 + 1164^2 .

It is not a de Polignac number, because 8245521 - 2¹ = 8245519 is a prime.

It is a super-2 number, since 2×8245521² = 135977233122882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8245571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 458076 + ... + 458093.

It is an arithmetic number, because the mean of its divisors is an integer number (1985035).

Almost surely, 2^8245521 is an apocalyptic number.

It is an amenable number.

8245521 is a deficient number, since it is larger than the sum of its proper divisors (3664689).

8245521 is a wasteful number, since it uses less digits than its factorization.

8245521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916175 (or 916172 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 8245521 is about 2871.5015235935. The cubic root of 8245521 is about 202.0254273125.

The spelling of 8245521 in words is "eight million, two hundred forty-five thousand, five hundred twenty-one".