13287565 has 4 divisors (see below), whose sum is σ = 15945084. Its totient is φ = 10630048.

The previous prime is 13287541. The next prime is 13287587. The reversal of 13287565 is 56578231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56578231 = 239 ⋅236729.

It can be written as a sum of positive squares in 2 ways, for example, as 7387524 + 5900041 = 2718^2 + 2429^2 .

It is a cyclic number.

It is not a de Polignac number, because 13287565 - 2¹³ = 13279373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328752 + ... + 1328761.

It is an arithmetic number, because the mean of its divisors is an integer number (3986271).

Almost surely, 2^13287565 is an apocalyptic number.

It is an amenable number.

13287565 is a deficient number, since it is larger than the sum of its proper divisors (2657519).

13287565 is an equidigital number, since it uses as much as digits as its factorization.

13287565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657518.

The product of its digits is 50400, while the sum is 37.

The square root of 13287565 is about 3645.2112421642. The cubic root of 13287565 is about 236.8545874600.

The spelling of 13287565 in words is "thirteen million, two hundred eighty-seven thousand, five hundred sixty-five".