138108079 has 2 divisors, whose sum is σ = 138108080. Its totient is φ = 138108078.

The previous prime is 138108071. The next prime is 138108109. The reversal of 138108079 is 970801831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138108079 - 2³ = 138108071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138108071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69054039 + 69054040.

It is an arithmetic number, because the mean of its divisors is an integer number (69054040).

Almost surely, 2^138108079 is an apocalyptic number.

138108079 is a deficient number, since it is larger than the sum of its proper divisors (1).

138108079 is an equidigital number, since it uses as much as digits as its factorization.

138108079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 138108079 is about 11751.9393718654. The cubic root of 138108079 is about 516.8997968839.

The spelling of 138108079 in words is "one hundred thirty-eight million, one hundred eight thousand, seventy-nine".