138611959 has 2 divisors, whose sum is σ = 138611960. Its totient is φ = 138611958.

The previous prime is 138611929. The next prime is 138611969. The reversal of 138611959 is 959116831.

It is a strong prime.

It is an emirp because it is prime and its reverse (959116831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138611959 - 2⁵ = 138611927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138611929) 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, 69305979 + 69305980.

It is an arithmetic number, because the mean of its divisors is an integer number (69305980).

Almost surely, 2^138611959 is an apocalyptic number.

138611959 is a deficient number, since it is larger than the sum of its proper divisors (1).

138611959 is an equidigital number, since it uses as much as digits as its factorization.

138611959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The square root of 138611959 is about 11773.3580171504. The cubic root of 138611959 is about 517.5276610884.

The spelling of 138611959 in words is "one hundred thirty-eight million, six hundred eleven thousand, nine hundred fifty-nine".