172123065 has 24 divisors (see below), whose sum is σ = 303980040. Its totient is φ = 90065664.

The previous prime is 172123057. The next prime is 172123093. The reversal of 172123065 is 560321271.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4782969 + 167340096 = 2187^2 + 12936^2 .

It is not a de Polignac number, because 172123065 - 2³ = 172123057 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33700 + ... + 38469.

It is an arithmetic number, because the mean of its divisors is an integer number (12665835).

Almost surely, 2^172123065 is an apocalyptic number.

172123065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172123065 is a deficient number, since it is larger than the sum of its proper divisors (131856975).

172123065 is a wasteful number, since it uses less digits than its factorization.

172123065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72233 (or 72230 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 172123065 is about 13119.5680188031. The cubic root of 172123065 is about 556.2623809053.

The spelling of 172123065 in words is "one hundred seventy-two million, one hundred twenty-three thousand, sixty-five".