165272171 has 2 divisors, whose sum is σ = 165272172. Its totient is φ = 165272170.

The previous prime is 165272161. The next prime is 165272201. The reversal of 165272171 is 171272561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165272171 - 2²² = 161077867 is a prime.

It is not a weakly prime, because it can be changed into another prime (165272101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82636085 + 82636086.

It is an arithmetic number, because the mean of its divisors is an integer number (82636086).

Almost surely, 2^165272171 is an apocalyptic number.

165272171 is a deficient number, since it is larger than the sum of its proper divisors (1).

165272171 is an equidigital number, since it uses as much as digits as its factorization.

165272171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 32.

The square root of 165272171 is about 12855.8224552146. The cubic root of 165272171 is about 548.7820664010.

The spelling of 165272171 in words is "one hundred sixty-five million, two hundred seventy-two thousand, one hundred seventy-one".