817316842 has 12 divisors (see below), whose sum is σ = 1229143266. Its totient is φ = 407604680.

The previous prime is 817316839. The next prime is 817316849. The reversal of 817316842 is 248613718.

It can be written as a sum of positive squares in only one way, i.e., 660541401 + 156775441 = 25701^2 + 12521^2 .

It is a junction number, because it is equal to n+sod(n) for n = 817316795 and 817316804.

It is not an unprimeable number, because it can be changed into a prime (817316849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 868092 + ... + 869032.

Almost surely, 2^817316842 is an apocalyptic number.

817316842 is a deficient number, since it is larger than the sum of its proper divisors (411826424).

817316842 is an frugal number, since it uses more digits than its factorization.

817316842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 1602 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 817316842 is about 28588.7537678717. The cubic root of 817316842 is about 934.9681486095.

The spelling of 817316842 in words is "eight hundred seventeen million, three hundred sixteen thousand, eight hundred forty-two".