191140917823 has 2 divisors, whose sum is σ = 191140917824. Its totient is φ = 191140917822.

The previous prime is 191140917763. The next prime is 191140917839. The reversal of 191140917823 is 328719041191.

191140917823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191140917823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191140917223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95570458911 + 95570458912.

It is an arithmetic number, because the mean of its divisors is an integer number (95570458912).

Almost surely, 2^191140917823 is an apocalyptic number.

191140917823 is a deficient number, since it is larger than the sum of its proper divisors (1).

191140917823 is an equidigital number, since it uses as much as digits as its factorization.

191140917823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 191140917823 in words is "one hundred ninety-one billion, one hundred forty million, nine hundred seventeen thousand, eight hundred twenty-three".