191000189 has 2 divisors, whose sum is σ = 191000190. Its totient is φ = 191000188.

The previous prime is 191000149. The next prime is 191000203. The reversal of 191000189 is 981000191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190716100 + 284089 = 13810^2 + 533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191000189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191000129) 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, 95500094 + 95500095.

It is an arithmetic number, because the mean of its divisors is an integer number (95500095).

Almost surely, 2^191000189 is an apocalyptic number.

It is an amenable number.

191000189 is a deficient number, since it is larger than the sum of its proper divisors (1).

191000189 is an equidigital number, since it uses as much as digits as its factorization.

191000189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 191000189 is about 13820.2817988636. The cubic root of 191000189 is about 575.8967120046.

The spelling of 191000189 in words is "one hundred ninety-one million, one hundred eighty-nine", and thus it is an aban number.