11111543 has 4 divisors (see below), whose sum is σ = 11123448. Its totient is φ = 11099640.

The previous prime is 11111531. The next prime is 11111579. The reversal of 11111543 is 34511111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11111543 - 2¹⁴ = 11095159 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 (11116543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4421 + ... + 6462.

It is an arithmetic number, because the mean of its divisors is an integer number (2780862).

Almost surely, 2^11111543 is an apocalyptic number.

11111543 is a deficient number, since it is larger than the sum of its proper divisors (11905).

11111543 is a wasteful number, since it uses less digits than its factorization.

11111543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11904.

The product of its digits is 60, while the sum is 17.

The square root of 11111543 is about 3333.3981160371. The cubic root of 11111543 is about 223.1472078631.

Adding to 11111543 its reverse (34511111), we get a palindrome (45622654).

The spelling of 11111543 in words is "eleven million, one hundred eleven thousand, five hundred forty-three".