8225209 has 4 divisors (see below), whose sum is σ = 8234100. Its totient is φ = 8216320.

The previous prime is 8225207. The next prime is 8225257. The reversal of 8225209 is 9025228.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5419584 + 2805625 = 2328^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 8225209 - 2¹ = 8225207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8225201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2872 + ... + 4969.

It is an arithmetic number, because the mean of its divisors is an integer number (2058525).

Almost surely, 2^8225209 is an apocalyptic number.

It is an amenable number.

8225209 is a deficient number, since it is larger than the sum of its proper divisors (8891).

8225209 is a wasteful number, since it uses less digits than its factorization.

8225209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8890.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 8225209 is about 2867.9625171888. The cubic root of 8225209 is about 201.8594012300.

The spelling of 8225209 in words is "eight million, two hundred twenty-five thousand, two hundred nine".