189662747191 has 4 divisors (see below), whose sum is σ = 190798452432. Its totient is φ = 188527041952.

The previous prime is 189662747149. The next prime is 189662747227. The reversal of 189662747191 is 191747266981.

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-189662747191 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 (189632747191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567852370 + ... + 567852703.

It is an arithmetic number, because the mean of its divisors is an integer number (47699613108).

Almost surely, 2^189662747191 is an apocalyptic number.

189662747191 is a deficient number, since it is larger than the sum of its proper divisors (1135705241).

189662747191 is a wasteful number, since it uses less digits than its factorization.

189662747191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135705240.

The product of its digits is 9144576, while the sum is 61.

The spelling of 189662747191 in words is "one hundred eighty-nine billion, six hundred sixty-two million, seven hundred forty-seven thousand, one hundred ninety-one".