111543 has 4 divisors (see below), whose sum is σ = 148728. Its totient is φ = 74360.

The previous prime is 111539. The next prime is 111577. The reversal of 111543 is 345111.

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 111543 - 2² = 111539 is a prime.

It is a D-number.

111543 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 111543.

It is not an unprimeable number, because it can be changed into a prime (111533) 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, 18588 + ... + 18593.

It is an arithmetic number, because the mean of its divisors is an integer number (37182).

2¹¹¹⁵⁴³ is an apocalyptic number.

111543 is a deficient number, since it is larger than the sum of its proper divisors (37185).

111543 is an equidigital number, since it uses as much as digits as its factorization.

111543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37184.

The product of its digits is 60, while the sum is 15.

The square root of 111543 is about 333.9805383552. The cubic root of 111543 is about 48.1371943012.

Adding to 111543 its reverse (345111), we get a palindrome (456654).

The spelling of 111543 in words is "one hundred eleven thousand, five hundred forty-three".