111443999 has 4 divisors (see below), whose sum is σ = 111483600. Its totient is φ = 111404400.

The previous prime is 111443971. The next prime is 111444007. The reversal of 111443999 is 999344111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999344111 = 131 ⋅7628581.

It is a cyclic number.

It is not a de Polignac number, because 111443999 - 2¹² = 111439903 is a prime.

It is a super-2 number, since 2×111443999² = 24839529826224002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111443929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15227 + ... + 21324.

It is an arithmetic number, because the mean of its divisors is an integer number (27870900).

Almost surely, 2^111443999 is an apocalyptic number.

111443999 is a deficient number, since it is larger than the sum of its proper divisors (39601).

111443999 is an equidigital number, since it uses as much as digits as its factorization.

111443999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39600.

The product of its digits is 34992, while the sum is 41.

The square root of 111443999 is about 10556.7039837252. The cubic root of 111443999 is about 481.2294855145.

The spelling of 111443999 in words is "one hundred eleven million, four hundred forty-three thousand, nine hundred ninety-nine".