138616105 has 4 divisors (see below), whose sum is σ = 166339332. Its totient is φ = 110892880.

The previous prime is 138616087. The next prime is 138616109. The reversal of 138616105 is 501616831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 501616831 = 113 ⋅4439087.

It can be written as a sum of positive squares in 2 ways, for example, as 93296281 + 45319824 = 9659^2 + 6732^2 .

It is not a de Polignac number, because 138616105 - 2⁵ = 138616073 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138616109) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13861606 + ... + 13861615.

It is an arithmetic number, because the mean of its divisors is an integer number (41584833).

Almost surely, 2^138616105 is an apocalyptic number.

It is an amenable number.

138616105 is a deficient number, since it is larger than the sum of its proper divisors (27723227).

138616105 is an equidigital number, since it uses as much as digits as its factorization.

138616105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27723226.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 138616105 is about 11773.5340913423. The cubic root of 138616105 is about 517.5328209325.

The spelling of 138616105 in words is "one hundred thirty-eight million, six hundred sixteen thousand, one hundred five".