111443409 has 24 divisors (see below), whose sum is σ = 200695872. Its totient is φ = 57892320.

The previous prime is 111443399. The next prime is 111443413. The reversal of 111443409 is 904344111.

It is not a de Polignac number, because 111443409 - 2⁴ = 111443393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111443489) 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, 79714 + ... + 81099.

It is an arithmetic number, because the mean of its divisors is an integer number (8362328).

Almost surely, 2^111443409 is an apocalyptic number.

It is an amenable number.

111443409 is a deficient number, since it is larger than the sum of its proper divisors (89252463).

111443409 is a wasteful number, since it uses less digits than its factorization.

111443409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160837 (or 160834 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 111443409 is about 10556.6760393601. The cubic root of 111443409 is about 481.2286362811.

The spelling of 111443409 in words is "one hundred eleven million, four hundred forty-three thousand, four hundred nine".