172158169 has 2 divisors, whose sum is σ = 172158170. Its totient is φ = 172158168.

The previous prime is 172158157. The next prime is 172158211. The reversal of 172158169 is 961851271.

It is a happy number.

172158169 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 can be written as a sum of positive squares in only one way, i.e., 137170944 + 34987225 = 11712^2 + 5915^2 .

It is a cyclic number.

It is not a de Polignac number, because 172158169 - 2¹¹ = 172156121 is a prime.

It is a super-2 number, since 2×172158169² = 59276870306865122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (172158769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86079084 + 86079085.

It is an arithmetic number, because the mean of its divisors is an integer number (86079085).

Almost surely, 2^172158169 is an apocalyptic number.

It is an amenable number.

172158169 is a deficient number, since it is larger than the sum of its proper divisors (1).

172158169 is an equidigital number, since it uses as much as digits as its factorization.

172158169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 40.

The square root of 172158169 is about 13120.9057995247. The cubic root of 172158169 is about 556.3001943679.

The spelling of 172158169 in words is "one hundred seventy-two million, one hundred fifty-eight thousand, one hundred sixty-nine".