138889171 has 2 divisors, whose sum is σ = 138889172. Its totient is φ = 138889170.

The previous prime is 138889151. The next prime is 138889193. The reversal of 138889171 is 171988831.

138889171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138889171 - 2⁵ = 138889139 is a prime.

It is not a weakly prime, because it can be changed into another prime (138889141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69444585 + 69444586.

It is an arithmetic number, because the mean of its divisors is an integer number (69444586).

Almost surely, 2^138889171 is an apocalyptic number.

138889171 is a deficient number, since it is larger than the sum of its proper divisors (1).

138889171 is an equidigital number, since it uses as much as digits as its factorization.

138889171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 46.

The square root of 138889171 is about 11785.1249887305. The cubic root of 138889171 is about 517.8724349593.

The spelling of 138889171 in words is "one hundred thirty-eight million, eight hundred eighty-nine thousand, one hundred seventy-one".