138006111 has 4 divisors (see below), whose sum is σ = 184008152. Its totient is φ = 92004072.

The previous prime is 138006107. The next prime is 138006137. The reversal of 138006111 is 111600831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111600831 = 3 ⋅37200277.

It is not a de Polignac number, because 138006111 - 2² = 138006107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138006151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23001016 + ... + 23001021.

It is an arithmetic number, because the mean of its divisors is an integer number (46002038).

Almost surely, 2^138006111 is an apocalyptic number.

138006111 is a deficient number, since it is larger than the sum of its proper divisors (46002041).

138006111 is an equidigital number, since it uses as much as digits as its factorization.

138006111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46002040.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 138006111 is about 11747.6002230243. The cubic root of 138006111 is about 516.7725530234.

Adding to 138006111 its reverse (111600831), we get a palindrome (249606942).

The spelling of 138006111 in words is "one hundred thirty-eight million, six thousand, one hundred eleven".