138321089 has 2 divisors, whose sum is σ = 138321090. Its totient is φ = 138321088.

The previous prime is 138321049. The next prime is 138321143. The reversal of 138321089 is 980123831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107329600 + 30991489 = 10360^2 + 5567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138321089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138321049) 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, 69160544 + 69160545.

It is an arithmetic number, because the mean of its divisors is an integer number (69160545).

Almost surely, 2^138321089 is an apocalyptic number.

It is an amenable number.

138321089 is a deficient number, since it is larger than the sum of its proper divisors (1).

138321089 is an equidigital number, since it uses as much as digits as its factorization.

138321089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 138321089 is about 11760.9986395714. The cubic root of 138321089 is about 517.1654059357.

The spelling of 138321089 in words is "one hundred thirty-eight million, three hundred twenty-one thousand, eighty-nine".