138531125 has 16 divisors (see below), whose sum is σ = 173247984. Its totient is φ = 110593600.

The previous prime is 138531103. The next prime is 138531131. The reversal of 138531125 is 521135831.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 38651089 + 99880036 = 6217^2 + 9994^2 .

It is not a de Polignac number, because 138531125 - 2¹⁴ = 138514741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83807 + ... + 85443.

It is an arithmetic number, because the mean of its divisors is an integer number (10827999).

Almost surely, 2^138531125 is an apocalyptic number.

It is an amenable number.

138531125 is a deficient number, since it is larger than the sum of its proper divisors (34716859).

138531125 is an equidigital number, since it uses as much as digits as its factorization.

138531125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329 (or 2319 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 138531125 is about 11769.9245961901. The cubic root of 138531125 is about 517.4270397425.

Adding to 138531125 its reverse (521135831), we get a palindrome (659666956).

The spelling of 138531125 in words is "one hundred thirty-eight million, five hundred thirty-one thousand, one hundred twenty-five".