11042543 has 4 divisors (see below), whose sum is σ = 11071320. Its totient is φ = 11013768.

The previous prime is 11042531. The next prime is 11042561. The reversal of 11042543 is 34524011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34524011 = 839 ⋅41149.

It is a cyclic number.

It is not a de Polignac number, because 11042543 - 2²⁰ = 9993967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11042513) 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, 13805 + ... + 14582.

It is an arithmetic number, because the mean of its divisors is an integer number (2767830).

Almost surely, 2^11042543 is an apocalyptic number.

11042543 is a deficient number, since it is larger than the sum of its proper divisors (28777).

11042543 is an equidigital number, since it uses as much as digits as its factorization.

11042543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28776.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 11042543 is about 3323.0321996634. The cubic root of 11042543 is about 222.6843516955.

Adding to 11042543 its reverse (34524011), we get a palindrome (45566554).

The spelling of 11042543 in words is "eleven million, forty-two thousand, five hundred forty-three".