138525517 has 16 divisors (see below), whose sum is σ = 153498240. Its totient is φ = 124218432.

The previous prime is 138525487. The next prime is 138525529. The reversal of 138525517 is 715525831.

It is a happy number.

It is not a de Polignac number, because 138525517 - 2¹⁵ = 138492749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138525017) 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 in 15 ways as a sum of consecutive naturals, for example, 72784 + ... + 74662.

It is an arithmetic number, because the mean of its divisors is an integer number (9593640).

Almost surely, 2^138525517 is an apocalyptic number.

It is an amenable number.

138525517 is a deficient number, since it is larger than the sum of its proper divisors (14972723).

138525517 is a wasteful number, since it uses less digits than its factorization.

138525517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052.

The product of its digits is 42000, while the sum is 37.

The square root of 138525517 is about 11769.6863594575. The cubic root of 138525517 is about 517.4200575090.

The spelling of 138525517 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, five hundred seventeen".