138266111 has 4 divisors (see below), whose sum is σ = 138817224. Its totient is φ = 137715000.

The previous prime is 138266099. The next prime is 138266119. The reversal of 138266111 is 111662831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111662831 = 7 ⋅15951833.

It is a cyclic number.

It is not a de Polignac number, because 138266111 - 2⁶ = 138266047 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 (138266119) 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, 275180 + ... + 275681.

It is an arithmetic number, because the mean of its divisors is an integer number (34704306).

Almost surely, 2^138266111 is an apocalyptic number.

138266111 is a deficient number, since it is larger than the sum of its proper divisors (551113).

138266111 is an equidigital number, since it uses as much as digits as its factorization.

138266111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551112.

The product of its digits is 1728, while the sum is 29.

The square root of 138266111 is about 11758.6611057552. The cubic root of 138266111 is about 517.0968782134.

The spelling of 138266111 in words is "one hundred thirty-eight million, two hundred sixty-six thousand, one hundred eleven".