13215663 has 16 divisors (see below), whose sum is σ = 20035840. Its totient is φ = 8604792.

The previous prime is 13215661. The next prime is 13215691. The reversal of 13215663 is 36651231.

13215663 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13215663 - 2¹ = 13215661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4531 + ... + 6852.

It is an arithmetic number, because the mean of its divisors is an integer number (1252240).

Almost surely, 2^13215663 is an apocalyptic number.

13215663 is a deficient number, since it is larger than the sum of its proper divisors (6820177).

13215663 is a wasteful number, since it uses less digits than its factorization.

13215663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11435 (or 11429 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 13215663 is about 3635.3353352889. The cubic root of 13215663 is about 236.4265900674.

Adding to 13215663 its reverse (36651231), we get a palindrome (49866894).

The spelling of 13215663 in words is "thirteen million, two hundred fifteen thousand, six hundred sixty-three".