816934309 has 4 divisors (see below), whose sum is σ = 852453216. Its totient is φ = 781415404.

The previous prime is 816934277. The next prime is 816934319. The reversal of 816934309 is 903439618.

816934309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 903439618 = 2 ⋅451719809.

It is a cyclic number.

It is not a de Polignac number, because 816934309 - 2⁵ = 816934277 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 (816934319) 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, 17759419 + ... + 17759464.

It is an arithmetic number, because the mean of its divisors is an integer number (213113304).

Almost surely, 2^816934309 is an apocalyptic number.

It is an amenable number.

816934309 is a deficient number, since it is larger than the sum of its proper divisors (35518907).

816934309 is a wasteful number, since it uses less digits than its factorization.

816934309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35518906.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 816934309 is about 28582.0627142269. The cubic root of 816934309 is about 934.8222598649.

The spelling of 816934309 in words is "eight hundred sixteen million, nine hundred thirty-four thousand, three hundred nine".