111123009989 has 2 divisors, whose sum is σ = 111123009990. Its totient is φ = 111123009988.

The previous prime is 111123009953. The next prime is 111123010039. The reversal of 111123009989 is 989900321111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109438564225 + 1684445764 = 330815^2 + 41042^2 .

It is a cyclic number.

It is not a de Polignac number, because 111123009989 - 2²⁸ = 110854574533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111123009289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55561504994 + 55561504995.

It is an arithmetic number, because the mean of its divisors is an integer number (55561504995).

Almost surely, 2^111123009989 is an apocalyptic number.

It is an amenable number.

111123009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111123009989 is an equidigital number, since it uses as much as digits as its factorization.

111123009989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 44.

The spelling of 111123009989 in words is "one hundred eleven billion, one hundred twenty-three million, nine thousand, nine hundred eighty-nine".