191368548217 has 16 divisors (see below), whose sum is σ = 238709624832. Its totient is φ = 149043183120.

The previous prime is 191368548209. The next prime is 191368548221. The reversal of 191368548217 is 712845863191.

It is a cyclic number.

It is not a de Polignac number, because 191368548217 - 2³ = 191368548209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191368548517) 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, 472393 + ... + 778390.

It is an arithmetic number, because the mean of its divisors is an integer number (14919351552).

Almost surely, 2^191368548217 is an apocalyptic number.

It is an amenable number.

191368548217 is a deficient number, since it is larger than the sum of its proper divisors (47341076615).

191368548217 is a wasteful number, since it uses less digits than its factorization.

191368548217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252788.

The product of its digits is 2903040, while the sum is 55.

The spelling of 191368548217 in words is "one hundred ninety-one billion, three hundred sixty-eight million, five hundred forty-eight thousand, two hundred seventeen".