111815843 has 2 divisors, whose sum is σ = 111815844. Its totient is φ = 111815842.

The previous prime is 111815839. The next prime is 111815923. The reversal of 111815843 is 348518111.

It is a weak prime.

It is an emirp because it is prime and its reverse (348518111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111815843 - 2² = 111815839 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111805843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55907921 + 55907922.

It is an arithmetic number, because the mean of its divisors is an integer number (55907922).

Almost surely, 2^111815843 is an apocalyptic number.

111815843 is a deficient number, since it is larger than the sum of its proper divisors (1).

111815843 is an equidigital number, since it uses as much as digits as its factorization.

111815843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 32.

The square root of 111815843 is about 10574.3010643730. The cubic root of 111815843 is about 481.7641147062.

It can be divided in two parts, 1118 and 15843, that added together give a palindrome (16961).

The spelling of 111815843 in words is "one hundred eleven million, eight hundred fifteen thousand, eight hundred forty-three".