189081 has 16 divisors (see below), whose sum is σ = 288000. Its totient is φ = 122544.

The previous prime is 189067. The next prime is 189127. The reversal of 189081 is 180981.

189081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189081 - 2⁶ = 189017 is a prime.

It is a super-2 number, since 2×189081² = 71503249122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1195 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (18000).

2¹⁸⁹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

189081 is a deficient number, since it is larger than the sum of its proper divisors (98919).

189081 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (189080) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (199).

189081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 189081 is about 434.8344512570. The cubic root of 189081 is about 57.3961325888.

Subtracting from 189081 its reverse (180981), we obtain a square (8100 = 90²).

The spelling of 189081 in words is "one hundred eighty-nine thousand, eighty-one".