191081927 has 2 divisors, whose sum is σ = 191081928. Its totient is φ = 191081926.

The previous prime is 191081873. The next prime is 191081959. The reversal of 191081927 is 729180191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191081927 - 2²⁰ = 190033351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191081977) 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, 95540963 + 95540964.

It is an arithmetic number, because the mean of its divisors is an integer number (95540964).

Almost surely, 2^191081927 is an apocalyptic number.

191081927 is a deficient number, since it is larger than the sum of its proper divisors (1).

191081927 is an equidigital number, since it uses as much as digits as its factorization.

191081927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 191081927 is about 13823.2386581438. The cubic root of 191081927 is about 575.9788514210.

The spelling of 191081927 in words is "one hundred ninety-one million, eighty-one thousand, nine hundred twenty-seven".