91189 has 6 divisors (see below), whose sum is σ = 106134. Its totient is φ = 78120.

The previous prime is 91183. The next prime is 91193. The reversal of 91189 is 98119.

It can be written as a sum of positive squares in only one way, i.e., 47089 + 44100 = 217^2 + 210^2 .

It is not a de Polignac number, because 91189 - 2⁹ = 90677 is a prime.

91189 is a modest number, since divided by 189 gives 91 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 882 + ... + 979.

It is an arithmetic number, because the mean of its divisors is an integer number (17689).

2⁹¹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

91189 is a deficient number, since it is larger than the sum of its proper divisors (14945).

91189 is a wasteful number, since it uses less digits than its factorization.

91189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1868 counting only the distinct ones).

The product of its digits is 648, while the sum is 28.

The square root of 91189 is about 301.9751645417. The cubic root of 91189 is about 45.0105325140.

It can be divided in two parts, 911 and 89, that added together give a cube (1000 = 10³).

The spelling of 91189 in words is "ninety-one thousand, one hundred eighty-nine".