138331117 has 2 divisors, whose sum is σ = 138331118. Its totient is φ = 138331116.

The previous prime is 138331093. The next prime is 138331139. The reversal of 138331117 is 711133831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105452361 + 32878756 = 10269^2 + 5734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138331117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138331717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69165558 + 69165559.

It is an arithmetic number, because the mean of its divisors is an integer number (69165559).

Almost surely, 2^138331117 is an apocalyptic number.

It is an amenable number.

138331117 is a deficient number, since it is larger than the sum of its proper divisors (1).

138331117 is an equidigital number, since it uses as much as digits as its factorization.

138331117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 138331117 is about 11761.4249561862. The cubic root of 138331117 is about 517.1779034501.

Adding to 138331117 its reverse (711133831), we get a palindrome (849464948).

The spelling of 138331117 in words is "one hundred thirty-eight million, three hundred thirty-one thousand, one hundred seventeen".