13603565 has 4 divisors (see below), whose sum is σ = 16324284. Its totient is φ = 10882848.

The previous prime is 13603547. The next prime is 13603567. The reversal of 13603565 is 56530631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56530631 = 643 ⋅87917.

It can be written as a sum of positive squares in 2 ways, for example, as 3034564 + 10569001 = 1742^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 13603565 - 2⁶ = 13603501 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 (13603567) 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, 1360352 + ... + 1360361.

It is an arithmetic number, because the mean of its divisors is an integer number (4081071).

Almost surely, 2^13603565 is an apocalyptic number.

It is an amenable number.

13603565 is a deficient number, since it is larger than the sum of its proper divisors (2720719).

13603565 is an equidigital number, since it uses as much as digits as its factorization.

13603565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720718.

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 13603565 is about 3688.3010994223. The cubic root of 13603565 is about 238.7174932671.

The spelling of 13603565 in words is "thirteen million, six hundred three thousand, five hundred sixty-five".