191055187 has 2 divisors, whose sum is σ = 191055188. Its totient is φ = 191055186.

The previous prime is 191055173. The next prime is 191055191. The reversal of 191055187 is 781550191.

191055187 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 not a de Polignac number, because 191055187 - 2¹¹ = 191053139 is a prime.

It is not a weakly prime, because it can be changed into another prime (191055167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95527593 + 95527594.

It is an arithmetic number, because the mean of its divisors is an integer number (95527594).

Almost surely, 2^191055187 is an apocalyptic number.

191055187 is a deficient number, since it is larger than the sum of its proper divisors (1).

191055187 is an equidigital number, since it uses as much as digits as its factorization.

191055187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 37.

The square root of 191055187 is about 13822.2714124705. The cubic root of 191055187 is about 575.9519826790.

The spelling of 191055187 in words is "one hundred ninety-one million, fifty-five thousand, one hundred eighty-seven".