172215265 has 4 divisors (see below), whose sum is σ = 206658324. Its totient is φ = 137772208.

The previous prime is 172215227. The next prime is 172215269. The reversal of 172215265 is 562512271.

172215265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562512271 = 19 ⋅29605909.

It can be written as a sum of positive squares in 2 ways, for example, as 77035729 + 95179536 = 8777^2 + 9756^2 .

It is a cyclic number.

It is not a de Polignac number, because 172215265 - 2¹⁹ = 171690977 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172215269) 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, 17221522 + ... + 17221531.

It is an arithmetic number, because the mean of its divisors is an integer number (51664581).

Almost surely, 2^172215265 is an apocalyptic number.

It is an amenable number.

172215265 is a deficient number, since it is larger than the sum of its proper divisors (34443059).

172215265 is an equidigital number, since it uses as much as digits as its factorization.

172215265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34443058.

The product of its digits is 8400, while the sum is 31.

The square root of 172215265 is about 13123.0813835776. The cubic root of 172215265 is about 556.3616862805.

The spelling of 172215265 in words is "one hundred seventy-two million, two hundred fifteen thousand, two hundred sixty-five".