13671565 has 8 divisors (see below), whose sum is σ = 16438680. Its totient is φ = 10915392.

The previous prime is 13671563. The next prime is 13671571. The reversal of 13671565 is 56517631.

It can be written as a sum of positive squares in 4 ways, for example, as 2368521 + 11303044 = 1539^2 + 3362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13671565 - 2¹ = 13671563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13671565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13671563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331 + ... + 5239.

It is an arithmetic number, because the mean of its divisors is an integer number (2054835).

Almost surely, 2^13671565 is an apocalyptic number.

It is an amenable number.

13671565 is a deficient number, since it is larger than the sum of its proper divisors (2767115).

13671565 is an equidigital number, since it uses as much as digits as its factorization.

13671565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5471.

The product of its digits is 18900, while the sum is 34.

The square root of 13671565 is about 3697.5079445486. The cubic root of 13671565 is about 239.1145905684.

The spelling of 13671565 in words is "thirteen million, six hundred seventy-one thousand, five hundred sixty-five".