138234017123 has 2 divisors, whose sum is σ = 138234017124. Its totient is φ = 138234017122.

The previous prime is 138234017093. The next prime is 138234017261. The reversal of 138234017123 is 321710432831.

It is a happy number.

138234017123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138234017123 - 2⁶ = 138234017059 is a prime.

It is not a weakly prime, because it can be changed into another prime (138234013123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69117008561 + 69117008562.

It is an arithmetic number, because the mean of its divisors is an integer number (69117008562).

Almost surely, 2^138234017123 is an apocalyptic number.

138234017123 is a deficient number, since it is larger than the sum of its proper divisors (1).

138234017123 is an equidigital number, since it uses as much as digits as its factorization.

138234017123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

Adding to 138234017123 its reverse (321710432831), we get a palindrome (459944449954).

The spelling of 138234017123 in words is "one hundred thirty-eight billion, two hundred thirty-four million, seventeen thousand, one hundred twenty-three".