13215565 has 8 divisors (see below), whose sum is σ = 17300448. Its totient is φ = 9611280.

The previous prime is 13215541. The next prime is 13215569. The reversal of 13215565 is 56551231.

13215565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13215565 - 2⁵ = 13215533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215569) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 120087 + ... + 120196.

It is an arithmetic number, because the mean of its divisors is an integer number (2162556).

Almost surely, 2^13215565 is an apocalyptic number.

It is an amenable number.

13215565 is a deficient number, since it is larger than the sum of its proper divisors (4084883).

13215565 is a wasteful number, since it uses less digits than its factorization.

13215565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240299.

The product of its digits is 4500, while the sum is 28.

The square root of 13215565 is about 3635.3218564523. The cubic root of 13215565 is about 236.4260056633.

Adding to 13215565 its reverse (56551231), we get a palindrome (69766796).

It can be divided in two parts, 1321 and 5565, that added together give a palindrome (6886).

The spelling of 13215565 in words is "thirteen million, two hundred fifteen thousand, five hundred sixty-five".