191080171 has 2 divisors, whose sum is σ = 191080172. Its totient is φ = 191080170.

The previous prime is 191080163. The next prime is 191080199. The reversal of 191080171 is 171080191.

It is an a-pointer prime, because the next prime (191080199) can be obtained adding 191080171 to its sum of digits (28).

It is a weak prime.

It is an emirp because it is prime and its reverse (171080191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191080171 - 2³ = 191080163 is a prime.

It is not a weakly prime, because it can be changed into another prime (191080111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95540085 + 95540086.

It is an arithmetic number, because the mean of its divisors is an integer number (95540086).

Almost surely, 2^191080171 is an apocalyptic number.

191080171 is a deficient number, since it is larger than the sum of its proper divisors (1).

191080171 is an equidigital number, since it uses as much as digits as its factorization.

191080171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 191080171 is about 13823.1751417683. The cubic root of 191080171 is about 575.9770870435.

The spelling of 191080171 in words is "one hundred ninety-one million, eighty thousand, one hundred seventy-one".