191451617191 has 2 divisors, whose sum is σ = 191451617192. Its totient is φ = 191451617190.

The previous prime is 191451617183. The next prime is 191451617311. The reversal of 191451617191 is 191716154191.

It is a weak prime.

It is an emirp because it is prime and its reverse (191716154191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191451617191 - 2³ = 191451617183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191451617101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95725808595 + 95725808596.

It is an arithmetic number, because the mean of its divisors is an integer number (95725808596).

Almost surely, 2^191451617191 is an apocalyptic number.

191451617191 is a deficient number, since it is larger than the sum of its proper divisors (1).

191451617191 is an equidigital number, since it uses as much as digits as its factorization.

191451617191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 46.

The spelling of 191451617191 in words is "one hundred ninety-one billion, four hundred fifty-one million, six hundred seventeen thousand, one hundred ninety-one".