111100209989 has 2 divisors, whose sum is σ = 111100209990. Its totient is φ = 111100209988.

The previous prime is 111100209923. The next prime is 111100210019. The reversal of 111100209989 is 989902001111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89740387489 + 21359822500 = 299567^2 + 146150^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100209989 - 2¹⁶ = 111100144453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100209589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550104994 + 55550104995.

It is an arithmetic number, because the mean of its divisors is an integer number (55550104995).

Almost surely, 2^111100209989 is an apocalyptic number.

It is an amenable number.

111100209989 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100209989 is an equidigital number, since it uses as much as digits as its factorization.

111100209989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 111100209989 in words is "one hundred eleven billion, one hundred million, two hundred nine thousand, nine hundred eighty-nine".