138361529 has 2 divisors, whose sum is σ = 138361530. Its totient is φ = 138361528.

The previous prime is 138361519. The next prime is 138361541. The reversal of 138361529 is 925163831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 11235904 = 11275^2 + 3352^2 .

It is an emirp because it is prime and its reverse (925163831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138361529 - 2⁴ = 138361513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138361492 and 138361501.

It is not a weakly prime, because it can be changed into another prime (138361519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69180764 + 69180765.

It is an arithmetic number, because the mean of its divisors is an integer number (69180765).

Almost surely, 2^138361529 is an apocalyptic number.

It is an amenable number.

138361529 is a deficient number, since it is larger than the sum of its proper divisors (1).

138361529 is an equidigital number, since it uses as much as digits as its factorization.

138361529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 138361529 is about 11762.7177556889. The cubic root of 138361529 is about 517.2158010739.

The spelling of 138361529 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, five hundred twenty-nine".