138966171 has 16 divisors (see below), whose sum is σ = 196838400. Its totient is φ = 86959008.

The previous prime is 138966167. The next prime is 138966187. The reversal of 138966171 is 171669831.

It is not a de Polignac number, because 138966171 - 2² = 138966167 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138966101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4971 + ... + 17396.

It is an arithmetic number, because the mean of its divisors is an integer number (12302400).

Almost surely, 2^138966171 is an apocalyptic number.

138966171 is a deficient number, since it is larger than the sum of its proper divisors (57872229).

138966171 is a wasteful number, since it uses less digits than its factorization.

138966171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22498.

The product of its digits is 54432, while the sum is 42.

The square root of 138966171 is about 11788.3913660855. The cubic root of 138966171 is about 517.9681199106.

The spelling of 138966171 in words is "one hundred thirty-eight million, nine hundred sixty-six thousand, one hundred seventy-one".