818915997 has 8 divisors (see below), whose sum is σ = 1092636160. Its totient is φ = 545569920.

The previous prime is 818915963. The next prime is 818916031. The reversal of 818915997 is 799519818.

It is an interprime number because it is at equal distance from previous prime (818915963) and next prime (818916031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 818915997 - 2⁷ = 818915869 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 (818915497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88372 + ... + 97197.

It is an arithmetic number, because the mean of its divisors is an integer number (136579520).

Almost surely, 2^818915997 is an apocalyptic number.

It is an amenable number.

818915997 is a deficient number, since it is larger than the sum of its proper divisors (273720163).

818915997 is a wasteful number, since it uses less digits than its factorization.

818915997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187043.

The product of its digits is 1632960, while the sum is 57.

The square root of 818915997 is about 28616.7083536874. The cubic root of 818915997 is about 935.5775348487.

The spelling of 818915997 in words is "eight hundred eighteen million, nine hundred fifteen thousand, nine hundred ninety-seven".