13215173 has 4 divisors (see below), whose sum is σ = 13257708. Its totient is φ = 13172640.

The previous prime is 13215151. The next prime is 13215187. The reversal of 13215173 is 37151231.

13215173 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.

It can be written as a sum of positive squares in 2 ways, for example, as 6235009 + 6980164 = 2497^2 + 2642^2 .

It is a cyclic number.

It is not a de Polignac number, because 13215173 - 2⁶ = 13215109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215113) 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, 20798 + ... + 21423.

It is an arithmetic number, because the mean of its divisors is an integer number (3314427).

Almost surely, 2^13215173 is an apocalyptic number.

It is an amenable number.

13215173 is a deficient number, since it is larger than the sum of its proper divisors (42535).

13215173 is an equidigital number, since it uses as much as digits as its factorization.

13215173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42534.

The product of its digits is 630, while the sum is 23.

The square root of 13215173 is about 3635.2679406063. The cubic root of 13215173 is about 236.4236680180.

The spelling of 13215173 in words is "thirteen million, two hundred fifteen thousand, one hundred seventy-three".