111543543 has 24 divisors (see below), whose sum is σ = 165071088. Its totient is φ = 72559872.

The previous prime is 111543533. The next prime is 111543559. The reversal of 111543543 is 345345111.

It is a happy number.

111543543 is a `hidden beast` number, since 1 + 115 + 4 + 3 + 543 = 666.

It is not a de Polignac number, because 111543543 - 2⁶ = 111543479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111543533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67321 + ... + 68957.

It is an arithmetic number, because the mean of its divisors is an integer number (6877962).

Almost surely, 2^111543543 is an apocalyptic number.

111543543 is a deficient number, since it is larger than the sum of its proper divisors (53527545).

111543543 is a wasteful number, since it uses less digits than its factorization.

111543543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823 (or 1820 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 111543543 is about 10561.4176605227. The cubic root of 111543543 is about 481.3727241294.

Adding to 111543543 its reverse (345345111), we get a palindrome (456888654).

The spelling of 111543543 in words is "one hundred eleven million, five hundred forty-three thousand, five hundred forty-three".