172323617 has 4 divisors (see below), whose sum is σ = 175575060. Its totient is φ = 169072176.

The previous prime is 172323563. The next prime is 172323623. The reversal of 172323617 is 716323271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716323271 = 17 ⋅42136663.

It can be written as a sum of positive squares in 2 ways, for example, as 110481121 + 61842496 = 10511^2 + 7864^2 .

It is a cyclic number.

It is not a de Polignac number, because 172323617 - 2¹⁶ = 172258081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172323677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625642 + ... + 1625747.

It is an arithmetic number, because the mean of its divisors is an integer number (43893765).

Almost surely, 2^172323617 is an apocalyptic number.

It is an amenable number.

172323617 is a deficient number, since it is larger than the sum of its proper divisors (3251443).

172323617 is an equidigital number, since it uses as much as digits as its factorization.

172323617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251442.

The product of its digits is 10584, while the sum is 32.

The square root of 172323617 is about 13127.2090331494. The cubic root of 172323617 is about 556.4783431153.

Adding to 172323617 its reverse (716323271), we get a palindrome (888646888).

The spelling of 172323617 in words is "one hundred seventy-two million, three hundred twenty-three thousand, six hundred seventeen".