138311111 has 2 divisors, whose sum is σ = 138311112. Its totient is φ = 138311110.

The previous prime is 138311101. The next prime is 138311149. The reversal of 138311111 is 111113831.

It is a weak prime.

It is an emirp because it is prime and its reverse (111113831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138311111 - 2¹⁰ = 138310087 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

138311111 is a modest number, since divided by 11111 gives 1383 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138311101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69155555 + 69155556.

It is an arithmetic number, because the mean of its divisors is an integer number (69155556).

Almost surely, 2^138311111 is an apocalyptic number.

138311111 is a deficient number, since it is larger than the sum of its proper divisors (1).

138311111 is an equidigital number, since it uses as much as digits as its factorization.

138311111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 20.

The square root of 138311111 is about 11760.5744332494. The cubic root of 138311111 is about 517.1529701350.

Adding to 138311111 its reverse (111113831), we get a palindrome (249424942).

The spelling of 138311111 in words is "one hundred thirty-eight million, three hundred eleven thousand, one hundred eleven".