172155173 has 2 divisors, whose sum is σ = 172155174. Its totient is φ = 172155172.

The previous prime is 172155149. The next prime is 172155199. The reversal of 172155173 is 371551271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150234049 + 21921124 = 12257^2 + 4682^2 .

It is a cyclic number.

It is not a de Polignac number, because 172155173 - 2¹⁴ = 172138789 is a prime.

It is a congruent number.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86077586 + 86077587.

It is an arithmetic number, because the mean of its divisors is an integer number (86077587).

Almost surely, 2^172155173 is an apocalyptic number.

It is an amenable number.

172155173 is a deficient number, since it is larger than the sum of its proper divisors (1).

172155173 is an equidigital number, since it uses as much as digits as its factorization.

172155173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 32.

The square root of 172155173 is about 13120.7916300809. The cubic root of 172155173 is about 556.2969673257.

The spelling of 172155173 in words is "one hundred seventy-two million, one hundred fifty-five thousand, one hundred seventy-three".