188105689 has 2 divisors, whose sum is σ = 188105690. Its totient is φ = 188105688.

The previous prime is 188105677. The next prime is 188105759. The reversal of 188105689 is 986501881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176491225 + 11614464 = 13285^2 + 3408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188105689 is a prime.

It is not a weakly prime, because it can be changed into another prime (188103689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94052844 + 94052845.

It is an arithmetic number, because the mean of its divisors is an integer number (94052845).

Almost surely, 2^188105689 is an apocalyptic number.

It is an amenable number.

188105689 is a deficient number, since it is larger than the sum of its proper divisors (1).

188105689 is an equidigital number, since it uses as much as digits as its factorization.

188105689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 188105689 is about 13715.1627405583. The cubic root of 188105689 is about 572.9727617975.

The spelling of 188105689 in words is "one hundred eighty-eight million, one hundred five thousand, six hundred eighty-nine".