816912797 has 4 divisors (see below), whose sum is σ = 832326300. Its totient is φ = 801499296.

The previous prime is 816912791. The next prime is 816912841. The reversal of 816912797 is 797219618.

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 287268601 + 529644196 = 16949^2 + 23014^2 .

It is a cyclic number.

It is not a de Polignac number, because 816912797 - 2⁸ = 816912541 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 (816912791) 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, 7706672 + ... + 7706777.

It is an arithmetic number, because the mean of its divisors is an integer number (208081575).

Almost surely, 2^816912797 is an apocalyptic number.

It is an amenable number.

816912797 is a deficient number, since it is larger than the sum of its proper divisors (15413503).

816912797 is a wasteful number, since it uses less digits than its factorization.

816912797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15413502.

The product of its digits is 381024, while the sum is 50.

The square root of 816912797 is about 28581.6863918139. The cubic root of 816912797 is about 934.8140543610.

The spelling of 816912797 in words is "eight hundred sixteen million, nine hundred twelve thousand, seven hundred ninety-seven".