816789313 has 4 divisors (see below), whose sum is σ = 816958660. Its totient is φ = 816619968.

The previous prime is 816789299. The next prime is 816789353. The reversal of 816789313 is 313987618.

816789313 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.

It can be written as a sum of positive squares in 2 ways, for example, as 303177744 + 513611569 = 17412^2 + 22663^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816789313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816789353) 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, 77220 + ... + 87157.

It is an arithmetic number, because the mean of its divisors is an integer number (204239665).

Almost surely, 2^816789313 is an apocalyptic number.

It is an amenable number.

816789313 is a deficient number, since it is larger than the sum of its proper divisors (169347).

816789313 is a wasteful number, since it uses less digits than its factorization.

816789313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169346.

The product of its digits is 217728, while the sum is 46.

The square root of 816789313 is about 28579.5261157354. The cubic root of 816789313 is about 934.7669500288.

The spelling of 816789313 in words is "eight hundred sixteen million, seven hundred eighty-nine thousand, three hundred thirteen".