138557165 has 8 divisors (see below), whose sum is σ = 166433400. Its totient is φ = 110735872.

The previous prime is 138557161. The next prime is 138557171. The reversal of 138557165 is 561755831.

It can be written as a sum of positive squares in 4 ways, for example, as 18369796 + 120187369 = 4286^2 + 10963^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138557165 - 2² = 138557161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138557161) 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 7 ways as a sum of consecutive naturals, for example, 7964 + ... + 18453.

It is an arithmetic number, because the mean of its divisors is an integer number (20804175).

Almost surely, 2^138557165 is an apocalyptic number.

It is an amenable number.

138557165 is a deficient number, since it is larger than the sum of its proper divisors (27876235).

138557165 is a wasteful number, since it uses less digits than its factorization.

138557165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27471.

The product of its digits is 126000, while the sum is 41.

The square root of 138557165 is about 11771.0307535067. The cubic root of 138557165 is about 517.4594583439.

The spelling of 138557165 in words is "one hundred thirty-eight million, five hundred fifty-seven thousand, one hundred sixty-five".