189111997 has 8 divisors (see below), whose sum is σ = 205487360. Its totient is φ = 173378880.

The previous prime is 189111971. The next prime is 189112013. The reversal of 189111997 is 799111981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189111997 - 2¹⁹ = 188587709 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 (189118997) 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 in 7 ways as a sum of consecutive naturals, for example, 159948 + ... + 161125.

It is an arithmetic number, because the mean of its divisors is an integer number (25685920).

Almost surely, 2^189111997 is an apocalyptic number.

It is an amenable number.

189111997 is a deficient number, since it is larger than the sum of its proper divisors (16375363).

189111997 is a wasteful number, since it uses less digits than its factorization.

189111997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321123.

The product of its digits is 40824, while the sum is 46.

The square root of 189111997 is about 13751.7997731206. The cubic root of 189111997 is about 573.9926882969.

The spelling of 189111997 in words is "one hundred eighty-nine million, one hundred eleven thousand, nine hundred ninety-seven".