138085279 has 2 divisors, whose sum is σ = 138085280. Its totient is φ = 138085278.

The previous prime is 138085249. The next prime is 138085289. The reversal of 138085279 is 972580831.

138085279 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 a cyclic number.

It is not a de Polignac number, because 138085279 - 2⁹ = 138084767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138085219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69042639 + 69042640.

It is an arithmetic number, because the mean of its divisors is an integer number (69042640).

Almost surely, 2^138085279 is an apocalyptic number.

138085279 is a deficient number, since it is larger than the sum of its proper divisors (1).

138085279 is an equidigital number, since it uses as much as digits as its factorization.

138085279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 138085279 is about 11750.9692791701. The cubic root of 138085279 is about 516.8713506505.

The spelling of 138085279 in words is "one hundred thirty-eight million, eighty-five thousand, two hundred seventy-nine".