12689569 has 4 divisors (see below), whose sum is σ = 12722580. Its totient is φ = 12656560.

The previous prime is 12689507. The next prime is 12689581. The reversal of 12689569 is 96598621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96598621 = 7 ⋅13799803.

It can be written as a sum of positive squares in 2 ways, for example, as 5198400 + 7491169 = 2280^2 + 2737^2 .

It is a cyclic number.

It is not a de Polignac number, because 12689569 - 2⁹ = 12689057 is a prime.

It is a super-2 number, since 2×12689569² = 322050322811522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12689069) 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, 15922 + ... + 16699.

It is an arithmetic number, because the mean of its divisors is an integer number (3180645).

Almost surely, 2^12689569 is an apocalyptic number.

It is an amenable number.

12689569 is a deficient number, since it is larger than the sum of its proper divisors (33011).

12689569 is an equidigital number, since it uses as much as digits as its factorization.

12689569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33010.

The product of its digits is 233280, while the sum is 46.

The square root of 12689569 is about 3562.2421310180. The cubic root of 12689569 is about 233.2467622155.

The spelling of 12689569 in words is "twelve million, six hundred eighty-nine thousand, five hundred sixty-nine".