8161909 has 8 divisors (see below), whose sum is σ = 9402368. Its totient is φ = 6940080.

The previous prime is 8161903. The next prime is 8161913. The reversal of 8161909 is 9091618.

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

It is not a de Polignac number, because 8161909 - 2¹⁵ = 8129141 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 (8161903) 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, 3702 + ... + 5479.

It is an arithmetic number, because the mean of its divisors is an integer number (1175296).

Almost surely, 2^8161909 is an apocalyptic number.

It is an amenable number.

8161909 is a deficient number, since it is larger than the sum of its proper divisors (1240459).

8161909 is a wasteful number, since it uses less digits than its factorization.

8161909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9315.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 8161909 is about 2856.9054937117. The cubic root of 8161909 is about 201.3402403836.

The spelling of 8161909 in words is "eight million, one hundred sixty-one thousand, nine hundred nine".