111491543 has 4 divisors (see below), whose sum is σ = 111558048. Its totient is φ = 111425040.

The previous prime is 111491537. The next prime is 111491579. The reversal of 111491543 is 345194111.

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 111491543 - 2¹² = 111487447 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 (111491243) 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, 30671 + ... + 34112.

It is an arithmetic number, because the mean of its divisors is an integer number (27889512).

Almost surely, 2^111491543 is an apocalyptic number.

111491543 is a deficient number, since it is larger than the sum of its proper divisors (66505).

111491543 is an equidigital number, since it uses as much as digits as its factorization.

111491543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66504.

The product of its digits is 2160, while the sum is 29.

The square root of 111491543 is about 10558.9555828216. The cubic root of 111491543 is about 481.2979094823.

The spelling of 111491543 in words is "one hundred eleven million, four hundred ninety-one thousand, five hundred forty-three".