111568889 has 2 divisors, whose sum is σ = 111568890. Its totient is φ = 111568888.

The previous prime is 111568843. The next prime is 111568937. The reversal of 111568889 is 988865111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93760489 + 17808400 = 9683^2 + 4220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111568889 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (111568819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55784444 + 55784445.

It is an arithmetic number, because the mean of its divisors is an integer number (55784445).

Almost surely, 2^111568889 is an apocalyptic number.

It is an amenable number.

111568889 is a deficient number, since it is larger than the sum of its proper divisors (1).

111568889 is an equidigital number, since it uses as much as digits as its factorization.

111568889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 47.

The square root of 111568889 is about 10562.6175259734. The cubic root of 111568889 is about 481.4091820863.

The spelling of 111568889 in words is "one hundred eleven million, five hundred sixty-eight thousand, eight hundred eighty-nine".