172191065 has 8 divisors (see below), whose sum is σ = 206797320. Its totient is φ = 137640832.

The previous prime is 172191031. The next prime is 172191073. The reversal of 172191065 is 560191271.

172191065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17909824 + 154281241 = 4232^2 + 12421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172191065 - 2¹⁰ = 172190041 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6914 + ... + 19803.

It is an arithmetic number, because the mean of its divisors is an integer number (25849665).

Almost surely, 2^172191065 is an apocalyptic number.

It is an amenable number.

172191065 is a deficient number, since it is larger than the sum of its proper divisors (34606255).

172191065 is a wasteful number, since it uses less digits than its factorization.

172191065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28011.

The product of its (nonzero) digits is 3780, while the sum is 32.

The square root of 172191065 is about 13122.1593116377. The cubic root of 172191065 is about 556.3356247434.

The spelling of 172191065 in words is "one hundred seventy-two million, one hundred ninety-one thousand, sixty-five".