138811105 has 4 divisors (see below), whose sum is σ = 166573332. Its totient is φ = 111048880.

The previous prime is 138811091. The next prime is 138811111. The reversal of 138811105 is 501118831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104693824 + 34117281 = 10232^2 + 5841^2 .

It is not a de Polignac number, because 138811105 - 2¹¹ = 138809057 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 13881106 + ... + 13881115.

It is an arithmetic number, because the mean of its divisors is an integer number (41643333).

Almost surely, 2^138811105 is an apocalyptic number.

It is an amenable number.

138811105 is a deficient number, since it is larger than the sum of its proper divisors (27762227).

138811105 is an equidigital number, since it uses as much as digits as its factorization.

138811105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27762226.

The product of its (nonzero) digits is 960, while the sum is 28.

The square root of 138811105 is about 11781.8124666793. The cubic root of 138811105 is about 517.7753892210.

Adding to 138811105 its reverse (501118831), we get a palindrome (639929936).

The spelling of 138811105 in words is "one hundred thirty-eight million, eight hundred eleven thousand, one hundred five".