817312673 has 4 divisors (see below), whose sum is σ = 817383060. Its totient is φ = 817242288.

The previous prime is 817312669. The next prime is 817312681. The reversal of 817312673 is 376213718.

817312673 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 662135824 + 155176849 = 25732^2 + 12457^2 .

It is a cyclic number.

It is not a de Polignac number, because 817312673 - 2² = 817312669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817312603) 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, 13190 + ... + 42527.

It is an arithmetic number, because the mean of its divisors is an integer number (204345765).

Almost surely, 2^817312673 is an apocalyptic number.

It is an amenable number.

817312673 is a deficient number, since it is larger than the sum of its proper divisors (70387).

817312673 is a wasteful number, since it uses less digits than its factorization.

817312673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70386.

The product of its digits is 42336, while the sum is 38.

The square root of 817312673 is about 28588.6808544920. The cubic root of 817312673 is about 934.9665589000.

The spelling of 817312673 in words is "eight hundred seventeen million, three hundred twelve thousand, six hundred seventy-three".