188631089 has 2 divisors, whose sum is σ = 188631090. Its totient is φ = 188631088.

The previous prime is 188631071. The next prime is 188631097. The reversal of 188631089 is 980136881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143808064 + 44823025 = 11992^2 + 6695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188631089 is a prime.

It is not a weakly prime, because it can be changed into another prime (188631019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94315544 + 94315545.

It is an arithmetic number, because the mean of its divisors is an integer number (94315545).

Almost surely, 2^188631089 is an apocalyptic number.

It is an amenable number.

188631089 is a deficient number, since it is larger than the sum of its proper divisors (1).

188631089 is an equidigital number, since it uses as much as digits as its factorization.

188631089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 188631089 is about 13734.3033678451. The cubic root of 188631089 is about 573.5057246681.

The spelling of 188631089 in words is "one hundred eighty-eight million, six hundred thirty-one thousand, eighty-nine".