11555643 has 16 divisors (see below), whose sum is σ = 17127936. Its totient is φ = 6870240.

The previous prime is 11555639. The next prime is 11555651. The reversal of 11555643 is 34655511.

11555643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11555643 - 2² = 11555639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11555643.

It is not an unprimeable number, because it can be changed into a prime (11555633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1555 + ... + 5052.

It is an arithmetic number, because the mean of its divisors is an integer number (1070496).

Almost surely, 2^11555643 is an apocalyptic number.

11555643 is a deficient number, since it is larger than the sum of its proper divisors (5572293).

11555643 is a wasteful number, since it uses less digits than its factorization.

11555643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674.

The product of its digits is 9000, while the sum is 30.

The square root of 11555643 is about 3399.3592043207. The cubic root of 11555643 is about 226.0813331404.

The spelling of 11555643 in words is "eleven million, five hundred fifty-five thousand, six hundred forty-three".