189000191 has 4 divisors (see below), whose sum is σ = 189427272. Its totient is φ = 188573112.

The previous prime is 189000167. The next prime is 189000197. The reversal of 189000191 is 191000981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189000191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189000197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212876 + ... + 213761.

It is an arithmetic number, because the mean of its divisors is an integer number (47356818).

Almost surely, 2^189000191 is an apocalyptic number.

189000191 is a deficient number, since it is larger than the sum of its proper divisors (427081).

189000191 is an equidigital number, since it uses as much as digits as its factorization.

189000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427080.

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

The square root of 189000191 is about 13747.7340314686. The cubic root of 189000191 is about 573.8795481490.

The spelling of 189000191 in words is "one hundred eighty-nine million, one hundred ninety-one", and thus it is an aban number.