111234199991 has 4 divisors (see below), whose sum is σ = 111234875184. Its totient is φ = 111233524800.

The previous prime is 111234199987. The next prime is 111234199997. The reversal of 111234199991 is 199991432111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 111234199991 - 2² = 111234199987 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 (111234199997) 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, 90326 + ... + 480236.

It is an arithmetic number, because the mean of its divisors is an integer number (27808718796).

Almost surely, 2^111234199991 is an apocalyptic number.

111234199991 is a deficient number, since it is larger than the sum of its proper divisors (675193).

111234199991 is an equidigital number, since it uses as much as digits as its factorization.

111234199991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675192.

The product of its digits is 157464, while the sum is 50.

The spelling of 111234199991 in words is "one hundred eleven billion, two hundred thirty-four million, one hundred ninety-nine thousand, nine hundred ninety-one".