813834809 has 4 divisors (see below), whose sum is σ = 856668240. Its totient is φ = 771001380.

The previous prime is 813834799. The next prime is 813834811. The reversal of 813834809 is 908438318.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 813834809 - 2¹² = 813830713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 813834809.

It is not an unprimeable number, because it can be changed into a prime (813834839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21416687 + ... + 21416724.

It is an arithmetic number, because the mean of its divisors is an integer number (214167060).

Almost surely, 2^813834809 is an apocalyptic number.

It is an amenable number.

813834809 is a deficient number, since it is larger than the sum of its proper divisors (42833431).

813834809 is a wasteful number, since it uses less digits than its factorization.

813834809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42833430.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 813834809 is about 28527.7901177080. The cubic root of 813834809 is about 933.6385034254.

The spelling of 813834809 in words is "eight hundred thirteen million, eight hundred thirty-four thousand, eight hundred nine".