111122019991 has 2 divisors, whose sum is σ = 111122019992. Its totient is φ = 111122019990.

The previous prime is 111122019971. The next prime is 111122020033. The reversal of 111122019991 is 199910221111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111122019991 - 2⁷ = 111122019863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111122019991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111122019901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561009995 + 55561009996.

It is an arithmetic number, because the mean of its divisors is an integer number (55561009996).

Almost surely, 2^111122019991 is an apocalyptic number.

111122019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

111122019991 is an equidigital number, since it uses as much as digits as its factorization.

111122019991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 37.

The spelling of 111122019991 in words is "one hundred eleven billion, one hundred twenty-two million, nineteen thousand, nine hundred ninety-one".