191911010171 has 2 divisors, whose sum is σ = 191911010172. Its totient is φ = 191911010170.

The previous prime is 191911010153. The next prime is 191911010209. The reversal of 191911010171 is 171010119191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191911010171 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (191911010771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95955505085 + 95955505086.

It is an arithmetic number, because the mean of its divisors is an integer number (95955505086).

Almost surely, 2^191911010171 is an apocalyptic number.

191911010171 is a deficient number, since it is larger than the sum of its proper divisors (1).

191911010171 is an equidigital number, since it uses as much as digits as its factorization.

191911010171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 32.

The spelling of 191911010171 in words is "one hundred ninety-one billion, nine hundred eleven million, ten thousand, one hundred seventy-one".