187189 has 2 divisors, whose sum is σ = 187190. Its totient is φ = 187188.

The previous prime is 187181. The next prime is 187193. The reversal of 187189 is 981781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 70225 = 342^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 187189 - 2³ = 187181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187181) 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 as a sum of consecutive naturals, namely, 93594 + 93595.

It is an arithmetic number, because the mean of its divisors is an integer number (93595).

2¹⁸⁷¹⁸⁹ is an apocalyptic number.

It is an amenable number.

187189 is a deficient number, since it is larger than the sum of its proper divisors (1).

187189 is an equidigital number, since it uses as much as digits as its factorization.

187189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 34.

The square root of 187189 is about 432.6534409894. The cubic root of 187189 is about 57.2040496261.

The spelling of 187189 in words is "one hundred eighty-seven thousand, one hundred eighty-nine".