186138171 has 6 divisors (see below), whose sum is σ = 268866260. Its totient is φ = 124092108.

The previous prime is 186138143. The next prime is 186138187. The reversal of 186138171 is 171831681.

It is a happy number.

It is not a de Polignac number, because 186138171 - 2²¹ = 184041019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (186138131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10341001 + ... + 10341018.

Almost surely, 2^186138171 is an apocalyptic number.

186138171 is a deficient number, since it is larger than the sum of its proper divisors (82728089).

186138171 is a wasteful number, since it uses less digits than its factorization.

186138171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20682025 (or 20682022 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 186138171 is about 13643.2463512171. The cubic root of 186138171 is about 570.9680594899.

The spelling of 186138171 in words is "one hundred eighty-six million, one hundred thirty-eight thousand, one hundred seventy-one".