13215535 has 4 divisors (see below), whose sum is σ = 15858648. Its totient is φ = 10572424.

The previous prime is 13215533. The next prime is 13215539. The reversal of 13215535 is 53551231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13215535 - 2¹ = 13215533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215533) 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, 1321549 + ... + 1321558.

It is an arithmetic number, because the mean of its divisors is an integer number (3964662).

Almost surely, 2^13215535 is an apocalyptic number.

13215535 is a deficient number, since it is larger than the sum of its proper divisors (2643113).

13215535 is an equidigital number, since it uses as much as digits as its factorization.

13215535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643112.

The product of its digits is 2250, while the sum is 25.

The square root of 13215535 is about 3635.3177302679. The cubic root of 13215535 is about 236.4258267635.

Adding to 13215535 its reverse (53551231), we get a palindrome (66766766).

The spelling of 13215535 in words is "thirteen million, two hundred fifteen thousand, five hundred thirty-five".