138228089 has 2 divisors, whose sum is σ = 138228090. Its totient is φ = 138228088.

The previous prime is 138228067. The next prime is 138228107. The reversal of 138228089 is 980822831.

It is a happy number.

138228089 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 can be written as a sum of positive squares in only one way, i.e., 136702864 + 1525225 = 11692^2 + 1235^2 .

It is an emirp because it is prime and its reverse (980822831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138228089 is a prime.

It is not a weakly prime, because it can be changed into another prime (138228029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69114044 + 69114045.

It is an arithmetic number, because the mean of its divisors is an integer number (69114045).

Almost surely, 2^138228089 is an apocalyptic number.

It is an amenable number.

138228089 is a deficient number, since it is larger than the sum of its proper divisors (1).

138228089 is an equidigital number, since it uses as much as digits as its factorization.

138228089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 138228089 is about 11757.0442288868. The cubic root of 138228089 is about 517.0494747925.

The spelling of 138228089 in words is "one hundred thirty-eight million, two hundred twenty-eight thousand, eighty-nine".