189111 has 12 divisors (see below), whose sum is σ = 273768. Its totient is φ = 116064.

The previous prime is 189067. The next prime is 189127. The reversal of 189111 is 111981.

It is not a de Polignac number, because 189111 - 2⁷ = 188983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321 + ... + 693.

It is an arithmetic number, because the mean of its divisors is an integer number (22814).

2¹⁸⁹¹¹¹ is an apocalyptic number.

189111 is a deficient number, since it is larger than the sum of its proper divisors (84657).

189111 is a wasteful number, since it uses less digits than its factorization.

189111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 389 counting only the distinct ones).

The product of its digits is 72, while the sum is 21.

The square root of 189111 is about 434.8689457756. The cubic root of 189111 is about 57.3991679597.

It can be divided in two parts, 189 and 111, that added together give a triangular number (300 = T₂₄).

The spelling of 189111 in words is "one hundred eighty-nine thousand, one hundred eleven".