111816385 has 4 divisors (see below), whose sum is σ = 134179668. Its totient is φ = 89453104.

The previous prime is 111816377. The next prime is 111816401. The reversal of 111816385 is 583618111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59413264 + 52403121 = 7708^2 + 7239^2 .

It is a cyclic number.

It is not a de Polignac number, because 111816385 - 2³ = 111816377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111816385.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 11181634 + ... + 11181643.

It is an arithmetic number, because the mean of its divisors is an integer number (33544917).

Almost surely, 2^111816385 is an apocalyptic number.

It is an amenable number.

111816385 is a deficient number, since it is larger than the sum of its proper divisors (22363283).

111816385 is an equidigital number, since it uses as much as digits as its factorization.

111816385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22363282.

The product of its digits is 5760, while the sum is 34.

The square root of 111816385 is about 10574.3266925133. The cubic root of 111816385 is about 481.7648931162.

The spelling of 111816385 in words is "one hundred eleven million, eight hundred sixteen thousand, three hundred eighty-five".