12516565 has 4 divisors (see below), whose sum is σ = 15019884. Its totient is φ = 10013248.

The previous prime is 12516563. The next prime is 12516571. The reversal of 12516565 is 56561521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9156676 + 3359889 = 3026^2 + 1833^2 .

It is a cyclic number.

It is not a de Polignac number, because 12516565 - 2¹ = 12516563 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 (12516563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251652 + ... + 1251661.

It is an arithmetic number, because the mean of its divisors is an integer number (3754971).

Almost surely, 2^12516565 is an apocalyptic number.

It is an amenable number.

12516565 is a deficient number, since it is larger than the sum of its proper divisors (2503319).

12516565 is an equidigital number, since it uses as much as digits as its factorization.

12516565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503318.

The product of its digits is 9000, while the sum is 31.

The square root of 12516565 is about 3537.8757750944. The cubic root of 12516565 is about 232.1819136540.

The spelling of 12516565 in words is "twelve million, five hundred sixteen thousand, five hundred sixty-five".