13563165 has 32 divisors (see below), whose sum is σ = 27058176. Its totient is φ = 5636160.

The previous prime is 13563149. The next prime is 13563191. The reversal of 13563165 is 56136531.

It is not a de Polignac number, because 13563165 - 2⁴ = 13563149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4717 + ... + 7026.

It is an arithmetic number, because the mean of its divisors is an integer number (845568).

Almost surely, 2^13563165 is an apocalyptic number.

13563165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13563165 is a deficient number, since it is larger than the sum of its proper divisors (13495011).

13563165 is a wasteful number, since it uses less digits than its factorization.

13563165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11769.

The product of its digits is 8100, while the sum is 30.

The square root of 13563165 is about 3682.8202508404. The cubic root of 13563165 is about 238.4809437635.

Adding to 13563165 its reverse (56136531), we get a palindrome (69699696).

The spelling of 13563165 in words is "thirteen million, five hundred sixty-three thousand, one hundred sixty-five".