8111809 has 8 divisors (see below), whose sum is σ = 8468712. Its totient is φ = 7762560.

The previous prime is 8111791. The next prime is 8111849. The reversal of 8111809 is 9081118.

It can be written as a sum of positive squares in 4 ways, for example, as 494209 + 7617600 = 703^2 + 2760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8111809 - 2⁷ = 8111681 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (8111849) 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 7 ways as a sum of consecutive naturals, for example, 307 + ... + 4039.

It is an arithmetic number, because the mean of its divisors is an integer number (1058589).

Almost surely, 2^8111809 is an apocalyptic number.

It is an amenable number.

8111809 is a deficient number, since it is larger than the sum of its proper divisors (356903).

8111809 is a wasteful number, since it uses less digits than its factorization.

8111809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 8111809 is about 2848.1237683781. The cubic root of 8111809 is about 200.9274343467.

The spelling of 8111809 in words is "eight million, one hundred eleven thousand, eight hundred nine".