188681189 has 2 divisors, whose sum is σ = 188681190. Its totient is φ = 188681188.

The previous prime is 188681183. The next prime is 188681201. The reversal of 188681189 is 981186881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183196225 + 5484964 = 13535^2 + 2342^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188681189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188681183) 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 as a sum of consecutive naturals, namely, 94340594 + 94340595.

It is an arithmetic number, because the mean of its divisors is an integer number (94340595).

Almost surely, 2^188681189 is an apocalyptic number.

It is an amenable number.

188681189 is a deficient number, since it is larger than the sum of its proper divisors (1).

188681189 is an equidigital number, since it uses as much as digits as its factorization.

188681189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 50.

The square root of 188681189 is about 13736.1271470528. The cubic root of 188681189 is about 573.5564941242.

The spelling of 188681189 in words is "one hundred eighty-eight million, six hundred eighty-one thousand, one hundred eighty-nine".