8549809 has 4 divisors (see below), whose sum is σ = 8844660. Its totient is φ = 8254960.

The previous prime is 8549797. The next prime is 8549837. The reversal of 8549809 is 9089458.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4928400 + 3621409 = 2220^2 + 1903^2 .

It is a cyclic number.

It is not a de Polignac number, because 8549809 - 2⁵ = 8549777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8549609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147382 + ... + 147439.

It is an arithmetic number, because the mean of its divisors is an integer number (2211165).

Almost surely, 2^8549809 is an apocalyptic number.

It is an amenable number.

8549809 is a deficient number, since it is larger than the sum of its proper divisors (294851).

8549809 is a wasteful number, since it uses less digits than its factorization.

8549809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294850.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 8549809 is about 2924.0056429494. The cubic root of 8549809 is about 204.4806126172.

It can be divided in two parts, 85 and 49809, that added together give a palindrome (49894).

The spelling of 8549809 in words is "eight million, five hundred forty-nine thousand, eight hundred nine".