809161906 has 16 divisors (see below), whose sum is σ = 1390455360. Its totient is φ = 345953520.

The previous prime is 809161901. The next prime is 809161943. The reversal of 809161906 is 609161908.

It is not an unprimeable number, because it can be changed into a prime (809161901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63105 + ... + 74836.

It is an arithmetic number, because the mean of its divisors is an integer number (86903460).

Almost surely, 2^809161906 is an apocalyptic number.

809161906 is a deficient number, since it is larger than the sum of its proper divisors (581293454).

809161906 is a wasteful number, since it uses less digits than its factorization.

809161906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138369.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 809161906 is about 28445.7713201804. The cubic root of 809161906 is about 931.8481404781.

The spelling of 809161906 in words is "eight hundred nine million, one hundred sixty-one thousand, nine hundred six".