138617911 has 2 divisors, whose sum is σ = 138617912. Its totient is φ = 138617910.

The previous prime is 138617909. The next prime is 138617917. The reversal of 138617911 is 119716831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138617911 - 2¹ = 138617909 is a prime.

Together with 138617909, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138617917) by changing a digit.

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 as a sum of consecutive naturals, namely, 69308955 + 69308956.

It is an arithmetic number, because the mean of its divisors is an integer number (69308956).

Almost surely, 2^138617911 is an apocalyptic number.

138617911 is a deficient number, since it is larger than the sum of its proper divisors (1).

138617911 is an equidigital number, since it uses as much as digits as its factorization.

138617911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 138617911 is about 11773.6107885389. The cubic root of 138617911 is about 517.5350685314.

The spelling of 138617911 in words is "one hundred thirty-eight million, six hundred seventeen thousand, nine hundred eleven".