12649569 has 4 divisors (see below), whose sum is σ = 16866096. Its totient is φ = 8433044.

The previous prime is 12649561. The next prime is 12649577. The reversal of 12649569 is 96594621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12649561) and next prime (12649577).

It is a cyclic number.

It is not a de Polignac number, because 12649569 - 2³ = 12649561 is a prime.

It is a super-2 number, since 2×12649569² = 320023191771522, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12649569.

It is not an unprimeable number, because it can be changed into a prime (12649561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2108259 + ... + 2108264.

It is an arithmetic number, because the mean of its divisors is an integer number (4216524).

Almost surely, 2^12649569 is an apocalyptic number.

It is an amenable number.

12649569 is a deficient number, since it is larger than the sum of its proper divisors (4216527).

12649569 is an equidigital number, since it uses as much as digits as its factorization.

12649569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216526.

The product of its digits is 116640, while the sum is 42.

The square root of 12649569 is about 3556.6232580919. The cubic root of 12649569 is about 233.0014244665.

The spelling of 12649569 in words is "twelve million, six hundred forty-nine thousand, five hundred sixty-nine".