138842617 has 2 divisors, whose sum is σ = 138842618. Its totient is φ = 138842616.

The previous prime is 138842593. The next prime is 138842659. The reversal of 138842617 is 716248831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87160896 + 51681721 = 9336^2 + 7189^2 .

It is a cyclic number.

It is not a de Polignac number, because 138842617 - 2⁷ = 138842489 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138842617.

It is not a weakly prime, because it can be changed into another prime (138842917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69421308 + 69421309.

It is an arithmetic number, because the mean of its divisors is an integer number (69421309).

Almost surely, 2^138842617 is an apocalyptic number.

It is an amenable number.

138842617 is a deficient number, since it is larger than the sum of its proper divisors (1).

138842617 is an equidigital number, since it uses as much as digits as its factorization.

138842617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 138842617 is about 11783.1497062543. The cubic root of 138842617 is about 517.8145669308.

The spelling of 138842617 in words is "one hundred thirty-eight million, eight hundred forty-two thousand, six hundred seventeen".