111443199991 has 4 divisors (see below), whose sum is σ = 111512464000. Its totient is φ = 111373935984.

The previous prime is 111443199977. The next prime is 111443200003. The reversal of 111443199991 is 199991344111.

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 111443199991 - 2⁷ = 111443199863 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 (111443199691) 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, 34629591 + ... + 34632808.

It is an arithmetic number, because the mean of its divisors is an integer number (27878116000).

Almost surely, 2^111443199991 is an apocalyptic number.

111443199991 is a deficient number, since it is larger than the sum of its proper divisors (69264009).

111443199991 is an equidigital number, since it uses as much as digits as its factorization.

111443199991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69264008.

The product of its digits is 314928, while the sum is 52.

The spelling of 111443199991 in words is "one hundred eleven billion, four hundred forty-three million, one hundred ninety-nine thousand, nine hundred ninety-one".