813683978191 has 16 divisors (see below), whose sum is σ = 998493972480. Its totient is φ = 647172005760.

The previous prime is 813683978161. The next prime is 813683978269. The reversal of 813683978191 is 191879386318.

It is a de Polignac number, because none of the positive numbers 2^k-813683978191 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 (813683978101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48144231 + ... + 48161128.

It is an arithmetic number, because the mean of its divisors is an integer number (62405873280).

Almost surely, 2^813683978191 is an apocalyptic number.

813683978191 is a deficient number, since it is larger than the sum of its proper divisors (184809994289).

813683978191 is a wasteful number, since it uses less digits than its factorization.

813683978191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96305454.

The product of its digits is 15676416, while the sum is 64.

The spelling of 813683978191 in words is "eight hundred thirteen billion, six hundred eighty-three million, nine hundred seventy-eight thousand, one hundred ninety-one".