191185117 has 2 divisors, whose sum is σ = 191185118. Its totient is φ = 191185116.

The previous prime is 191185097. The next prime is 191185129. The reversal of 191185117 is 711581191.

191185117 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 can be written as a sum of positive squares in only one way, i.e., 180069561 + 11115556 = 13419^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 191185117 - 2⁷ = 191184989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191185147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95592558 + 95592559.

It is an arithmetic number, because the mean of its divisors is an integer number (95592559).

Almost surely, 2^191185117 is an apocalyptic number.

It is an amenable number.

191185117 is a deficient number, since it is larger than the sum of its proper divisors (1).

191185117 is an equidigital number, since it uses as much as digits as its factorization.

191185117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 34.

The square root of 191185117 is about 13826.9706371280. The cubic root of 191185117 is about 576.0825147429.

The spelling of 191185117 in words is "one hundred ninety-one million, one hundred eighty-five thousand, one hundred seventeen".