138338611 has 4 divisors (see below), whose sum is σ = 141555832. Its totient is φ = 135121392.

The previous prime is 138338593. The next prime is 138338617. The reversal of 138338611 is 116833831.

138338611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 116833831 = 19 ⋅6149149.

It is a cyclic number.

It is not a de Polignac number, because 138338611 - 2⁹ = 138338099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138338617) 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, 1608546 + ... + 1608631.

It is an arithmetic number, because the mean of its divisors is an integer number (35388958).

Almost surely, 2^138338611 is an apocalyptic number.

138338611 is a deficient number, since it is larger than the sum of its proper divisors (3217221).

138338611 is an equidigital number, since it uses as much as digits as its factorization.

138338611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217220.

The product of its digits is 10368, while the sum is 34.

The square root of 138338611 is about 11761.7435357178. The cubic root of 138338611 is about 517.1872425424.

The spelling of 138338611 in words is "one hundred thirty-eight million, three hundred thirty-eight thousand, six hundred eleven".