138752525 has 18 divisors (see below), whose sum is σ = 174109950. Its totient is φ = 109685760.

The previous prime is 138752489. The next prime is 138752527. The reversal of 138752525 is 525257831.

It can be written as a sum of positive squares in 9 ways, for example, as 101163364 + 37589161 = 10058^2 + 6131^2 .

It is not a de Polignac number, because 138752525 - 2¹² = 138748429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138752527) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 718829 + ... + 719021.

It is an arithmetic number, because the mean of its divisors is an integer number (9672775).

Almost surely, 2^138752525 is an apocalyptic number.

It is an amenable number.

138752525 is a deficient number, since it is larger than the sum of its proper divisors (35357425).

138752525 is an equidigital number, since it uses as much as digits as its factorization.

138752525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 347 counting only the distinct ones).

The product of its digits is 84000, while the sum is 38.

The square root of 138752525 is about 11779.3261691830. The cubic root of 138752525 is about 517.7025431039.

The spelling of 138752525 in words is "one hundred thirty-eight million, seven hundred fifty-two thousand, five hundred twenty-five".