111885689 has 2 divisors, whose sum is σ = 111885690. Its totient is φ = 111885688.

The previous prime is 111885677. The next prime is 111885691. The reversal of 111885689 is 986588111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71690089 + 40195600 = 8467^2 + 6340^2 .

It is an emirp because it is prime and its reverse (986588111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111885689 - 2²⁰ = 110837113 is a prime.

Together with 111885691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111885629) 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, 55942844 + 55942845.

It is an arithmetic number, because the mean of its divisors is an integer number (55942845).

Almost surely, 2^111885689 is an apocalyptic number.

It is an amenable number.

111885689 is a deficient number, since it is larger than the sum of its proper divisors (1).

111885689 is an equidigital number, since it uses as much as digits as its factorization.

111885689 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 111885689 is about 10577.6031784143. The cubic root of 111885689 is about 481.8644054804.

The spelling of 111885689 in words is "one hundred eleven million, eight hundred eighty-five thousand, six hundred eighty-nine".