13215775 has 6 divisors (see below), whose sum is σ = 16387592. Its totient is φ = 10572600.

The previous prime is 13215767. The next prime is 13215779. The reversal of 13215775 is 57751231.

13215775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13215775 - 2³ = 13215767 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 (13215779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 264291 + ... + 264340.

Almost surely, 2^13215775 is an apocalyptic number.

13215775 is a deficient number, since it is larger than the sum of its proper divisors (3171817).

13215775 is an equidigital number, since it uses as much as digits as its factorization.

13215775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528641 (or 528636 counting only the distinct ones).

The product of its digits is 7350, while the sum is 31.

The square root of 13215775 is about 3635.3507396123. The cubic root of 13215775 is about 236.4272579542.

The spelling of 13215775 in words is "thirteen million, two hundred fifteen thousand, seven hundred seventy-five".