191291223911 has 2 divisors, whose sum is σ = 191291223912. Its totient is φ = 191291223910.

The previous prime is 191291223899. The next prime is 191291223943. The reversal of 191291223911 is 119322192191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191291223911 - 2²² = 191287029607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191291223811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95645611955 + 95645611956.

It is an arithmetic number, because the mean of its divisors is an integer number (95645611956).

Almost surely, 2^191291223911 is an apocalyptic number.

191291223911 is a deficient number, since it is larger than the sum of its proper divisors (1).

191291223911 is an equidigital number, since it uses as much as digits as its factorization.

191291223911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 41.

The spelling of 191291223911 in words is "one hundred ninety-one billion, two hundred ninety-one million, two hundred twenty-three thousand, nine hundred eleven".