138385771 has 2 divisors, whose sum is σ = 138385772. Its totient is φ = 138385770.

The previous prime is 138385747. The next prime is 138385843. The reversal of 138385771 is 177583831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138385771 - 2²³ = 129997163 is a prime.

It is not a weakly prime, because it can be changed into another prime (138385711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69192885 + 69192886.

It is an arithmetic number, because the mean of its divisors is an integer number (69192886).

Almost surely, 2^138385771 is an apocalyptic number.

138385771 is a deficient number, since it is larger than the sum of its proper divisors (1).

138385771 is an equidigital number, since it uses as much as digits as its factorization.

138385771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 138385771 is about 11763.7481696949. The cubic root of 138385771 is about 517.2460060337.

The spelling of 138385771 in words is "one hundred thirty-eight million, three hundred eighty-five thousand, seven hundred seventy-one".