189668191 has 2 divisors, whose sum is σ = 189668192. Its totient is φ = 189668190.

The previous prime is 189668183. The next prime is 189668239. The reversal of 189668191 is 191866981.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189668191 - 2³ = 189668183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189678191) 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, 94834095 + 94834096.

It is an arithmetic number, because the mean of its divisors is an integer number (94834096).

Almost surely, 2^189668191 is an apocalyptic number.

189668191 is a deficient number, since it is larger than the sum of its proper divisors (1).

189668191 is an equidigital number, since it uses as much as digits as its factorization.

189668191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 49.

The square root of 189668191 is about 13772.0075152463. The cubic root of 189668191 is about 574.5548574934.

The spelling of 189668191 in words is "one hundred eighty-nine million, six hundred sixty-eight thousand, one hundred ninety-one".