138617249 has 2 divisors, whose sum is σ = 138617250. Its totient is φ = 138617248.

The previous prime is 138617239. The next prime is 138617261. The reversal of 138617249 is 942716831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131515024 + 7102225 = 11468^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 138617249 - 2¹⁶ = 138551713 is a prime.

It is not a weakly prime, because it can be changed into another prime (138617209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69308624 + 69308625.

It is an arithmetic number, because the mean of its divisors is an integer number (69308625).

Almost surely, 2^138617249 is an apocalyptic number.

It is an amenable number.

138617249 is a deficient number, since it is larger than the sum of its proper divisors (1).

138617249 is an equidigital number, since it uses as much as digits as its factorization.

138617249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 138617249 is about 11773.5826747851. The cubic root of 138617249 is about 517.5342446630.

The spelling of 138617249 in words is "one hundred thirty-eight million, six hundred seventeen thousand, two hundred forty-nine".