8525209 has 16 divisors (see below), whose sum is σ = 10834560. Its totient is φ = 6514560.

The previous prime is 8525201. The next prime is 8525213. The reversal of 8525209 is 9025258.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8525209 - 2³ = 8525201 is a prime.

8525209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8525201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3037 + ... + 5125.

It is an arithmetic number, because the mean of its divisors is an integer number (677160).

Almost surely, 2^8525209 is an apocalyptic number.

It is an amenable number.

8525209 is a deficient number, since it is larger than the sum of its proper divisors (2309351).

8525209 is a wasteful number, since it uses less digits than its factorization.

8525209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 8525209 is about 2919.7960545216. The cubic root of 8525209 is about 204.2843097831.

The spelling of 8525209 in words is "eight million, five hundred twenty-five thousand, two hundred nine".