12656289 has 4 divisors (see below), whose sum is σ = 16875056. Its totient is φ = 8437524.

The previous prime is 12656251. The next prime is 12656291. The reversal of 12656289 is 98265621.

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 not a de Polignac number, because 12656289 - 2⁹ = 12655777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12656239) 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, 2109379 + ... + 2109384.

It is an arithmetic number, because the mean of its divisors is an integer number (4218764).

Almost surely, 2^12656289 is an apocalyptic number.

It is an amenable number.

12656289 is a deficient number, since it is larger than the sum of its proper divisors (4218767).

12656289 is an equidigital number, since it uses as much as digits as its factorization.

12656289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218766.

The product of its digits is 51840, while the sum is 39.

The square root of 12656289 is about 3557.5678489665. The cubic root of 12656289 is about 233.0426773183.

The spelling of 12656289 in words is "twelve million, six hundred fifty-six thousand, two hundred eighty-nine".