138517297 has 2 divisors, whose sum is σ = 138517298. Its totient is φ = 138517296.

The previous prime is 138517279. The next prime is 138517349. The reversal of 138517297 is 792715831.

Together with previous prime (138517279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100620961 + 37896336 = 10031^2 + 6156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138517297 is a prime.

It is not a weakly prime, because it can be changed into another prime (138517217) 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, 69258648 + 69258649.

It is an arithmetic number, because the mean of its divisors is an integer number (69258649).

Almost surely, 2^138517297 is an apocalyptic number.

It is an amenable number.

138517297 is a deficient number, since it is larger than the sum of its proper divisors (1).

138517297 is an equidigital number, since it uses as much as digits as its factorization.

138517297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 138517297 is about 11769.3371521084. The cubic root of 138517297 is about 517.4098228675.

The spelling of 138517297 in words is "one hundred thirty-eight million, five hundred seventeen thousand, two hundred ninety-seven".