138621125 has 16 divisors (see below), whose sum is σ = 173334720. Its totient is φ = 110682000.

The previous prime is 138621113. The next prime is 138621139. The reversal of 138621125 is 521126831.

It is not a de Polignac number, because 138621125 - 2¹⁰ = 138620101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106730 + ... + 108020.

It is an arithmetic number, because the mean of its divisors is an integer number (10833420).

Almost surely, 2^138621125 is an apocalyptic number.

It is an amenable number.

138621125 is a deficient number, since it is larger than the sum of its proper divisors (34713595).

138621125 is an equidigital number, since it uses as much as digits as its factorization.

138621125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165 (or 2155 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 138621125 is about 11773.7472794349. The cubic root of 138621125 is about 517.5390683629.

Adding to 138621125 its reverse (521126831), we get a palindrome (659747956).

The spelling of 138621125 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, one hundred twenty-five".