12291656 has 16 divisors (see below), whose sum is σ = 24819900. Its totient is φ = 5673024.

The previous prime is 12291649. The next prime is 12291661. The reversal of 12291656 is 65619221.

It is a happy number.

12291656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12180100 + 111556 = 3490^2 + 334^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58991 + ... + 59198.

Almost surely, 2^12291656 is an apocalyptic number.

It is an amenable number.

12291656 is an abundant number, since it is smaller than the sum of its proper divisors (12528244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12291656 is a wasteful number, since it uses less digits than its factorization.

12291656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118208 (or 118204 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 12291656 is about 3505.9458067688. The cubic root of 12291656 is about 230.7828146762.

The spelling of 12291656 in words is "twelve million, two hundred ninety-one thousand, six hundred fifty-six".