11555543 has 4 divisors (see below), whose sum is σ = 11954040. Its totient is φ = 11157048.

The previous prime is 11555501. The next prime is 11555549. The reversal of 11555543 is 34555511.

11555543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34555511 = 163 ⋅211997.

It is a cyclic number.

It is not a de Polignac number, because 11555543 - 2¹⁰ = 11554519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 398467 = 11555543 / (1 + 1 + 5 + 5 + 5 + 5 + 4 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555549) 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, 199205 + ... + 199262.

It is an arithmetic number, because the mean of its divisors is an integer number (2988510).

Almost surely, 2^11555543 is an apocalyptic number.

11555543 is a deficient number, since it is larger than the sum of its proper divisors (398497).

11555543 is an equidigital number, since it uses as much as digits as its factorization.

11555543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398496.

The product of its digits is 7500, while the sum is 29.

The square root of 11555543 is about 3399.3444956344. The cubic root of 11555543 is about 226.0806809858.

The spelling of 11555543 in words is "eleven million, five hundred fifty-five thousand, five hundred forty-three".