188944081 has 2 divisors, whose sum is σ = 188944082. Its totient is φ = 188944080.

The previous prime is 188944073. The next prime is 188944097. The reversal of 188944081 is 180449881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164352400 + 24591681 = 12820^2 + 4959^2 .

It is a cyclic number.

It is not a de Polignac number, because 188944081 - 2³ = 188944073 is a prime.

It is a super-2 number, since 2×188944081² = 71399731489869122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (188944981) 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, 94472040 + 94472041.

It is an arithmetic number, because the mean of its divisors is an integer number (94472041).

Almost surely, 2^188944081 is an apocalyptic number.

It is an amenable number.

188944081 is a deficient number, since it is larger than the sum of its proper divisors (1).

188944081 is an equidigital number, since it uses as much as digits as its factorization.

188944081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 188944081 is about 13745.6931800473. The cubic root of 188944081 is about 573.8227517893.

The spelling of 188944081 in words is "one hundred eighty-eight million, nine hundred forty-four thousand, eighty-one".