138379517 has 2 divisors, whose sum is σ = 138379518. Its totient is φ = 138379516.

The previous prime is 138379487. The next prime is 138379529. The reversal of 138379517 is 715973831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91948921 + 46430596 = 9589^2 + 6814^2 .

It is a cyclic number.

It is not a de Polignac number, because 138379517 - 2¹⁸ = 138117373 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 (138379597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69189758 + 69189759.

It is an arithmetic number, because the mean of its divisors is an integer number (69189759).

Almost surely, 2^138379517 is an apocalyptic number.

It is an amenable number.

138379517 is a deficient number, since it is larger than the sum of its proper divisors (1).

138379517 is an equidigital number, since it uses as much as digits as its factorization.

138379517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 138379517 is about 11763.4823500526. The cubic root of 138379517 is about 517.2382140349.

The spelling of 138379517 in words is "one hundred thirty-eight million, three hundred seventy-nine thousand, five hundred seventeen".