138218171 has 18 divisors (see below), whose sum is σ = 174114252. Its totient is φ = 109352880.

The previous prime is 138218167. The next prime is 138218183. The reversal of 138218171 is 171812831.

138218171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138218171 - 2² = 138218167 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138218111) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 65 + ... + 16626.

It is an arithmetic number, because the mean of its divisors is an integer number (9673014).

Almost surely, 2^138218171 is an apocalyptic number.

138218171 is a deficient number, since it is larger than the sum of its proper divisors (35896081).

138218171 is a wasteful number, since it uses less digits than its factorization.

138218171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16731 (or 16711 counting only the distinct ones).

The product of its digits is 2688, while the sum is 32.

The square root of 138218171 is about 11756.6224316340. The cubic root of 138218171 is about 517.0371082289.

The spelling of 138218171 in words is "one hundred thirty-eight million, two hundred eighteen thousand, one hundred seventy-one".