138888144529 has 2 divisors, whose sum is σ = 138888144530. Its totient is φ = 138888144528.

The previous prime is 138888144511. The next prime is 138888144539. The reversal of 138888144529 is 925441888831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135315093904 + 3573050625 = 367852^2 + 59775^2 .

It is a cyclic number.

It is not a de Polignac number, because 138888144529 - 2⁵ = 138888144497 is a prime.

It is not a weakly prime, because it can be changed into another prime (138888144509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69444072264 + 69444072265.

It is an arithmetic number, because the mean of its divisors is an integer number (69444072265).

Almost surely, 2^138888144529 is an apocalyptic number.

It is an amenable number.

138888144529 is a deficient number, since it is larger than the sum of its proper divisors (1).

138888144529 is an equidigital number, since it uses as much as digits as its factorization.

138888144529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17694720, while the sum is 61.

The spelling of 138888144529 in words is "one hundred thirty-eight billion, eight hundred eighty-eight million, one hundred forty-four thousand, five hundred twenty-nine".