191731075368 has 64 divisors (see below), whose sum is σ = 566692848000. Its totient is φ = 52891329792.

The previous prime is 191731075357. The next prime is 191731075381. The reversal of 191731075368 is 863570137191.

It is a self number, because there is not a number n which added to its sum of digits gives 191731075368.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19671963 + ... + 19681706.

It is an arithmetic number, because the mean of its divisors is an integer number (8854575750).

Almost surely, 2^191731075368 is an apocalyptic number.

It is an amenable number.

191731075368 is an abundant number, since it is smaller than the sum of its proper divisors (374961772632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191731075368 is a wasteful number, since it uses less digits than its factorization.

191731075368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39353714 (or 39353710 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 191731075368 in words is "one hundred ninety-one billion, seven hundred thirty-one million, seventy-five thousand, three hundred sixty-eight".