188138771 has 2 divisors, whose sum is σ = 188138772. Its totient is φ = 188138770.

The previous prime is 188138749. The next prime is 188138777. The reversal of 188138771 is 177831881.

It is a happy number.

188138771 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (177831881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188138771 is a prime.

It is not a weakly prime, because it can be changed into another prime (188138777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94069385 + 94069386.

It is an arithmetic number, because the mean of its divisors is an integer number (94069386).

Almost surely, 2^188138771 is an apocalyptic number.

188138771 is a deficient number, since it is larger than the sum of its proper divisors (1).

188138771 is an equidigital number, since it uses as much as digits as its factorization.

188138771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 44.

The square root of 188138771 is about 13716.3687249942. The cubic root of 188138771 is about 573.0063492520.

The spelling of 188138771 in words is "one hundred eighty-eight million, one hundred thirty-eight thousand, seven hundred seventy-one".