138342817 has 2 divisors, whose sum is σ = 138342818. Its totient is φ = 138342816.

The previous prime is 138342803. The next prime is 138342829. The reversal of 138342817 is 718243831.

138342817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101425041 + 36917776 = 10071^2 + 6076^2 .

It is an emirp because it is prime and its reverse (718243831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138342817 - 2⁷ = 138342689 is a prime.

It is not a weakly prime, because it can be changed into another prime (138342887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69171408 + 69171409.

It is an arithmetic number, because the mean of its divisors is an integer number (69171409).

Almost surely, 2^138342817 is an apocalyptic number.

It is an amenable number.

138342817 is a deficient number, since it is larger than the sum of its proper divisors (1).

138342817 is an equidigital number, since it uses as much as digits as its factorization.

138342817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 138342817 is about 11761.9223343805. The cubic root of 138342817 is about 517.1924839508.

The spelling of 138342817 in words is "one hundred thirty-eight million, three hundred forty-two thousand, eight hundred seventeen".