111818809 has 8 divisors (see below), whose sum is σ = 122479560. Its totient is φ = 101611776.

The previous prime is 111818783. The next prime is 111818813. The reversal of 111818809 is 908818111.

It can be written as a sum of positive squares in 4 ways, for example, as 29735209 + 82083600 = 5453^2 + 9060^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111818809 - 2⁹ = 111818297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111818869) 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 in 7 ways as a sum of consecutive naturals, for example, 112914 + ... + 113899.

It is an arithmetic number, because the mean of its divisors is an integer number (15309945).

Almost surely, 2^111818809 is an apocalyptic number.

It is an amenable number.

111818809 is a deficient number, since it is larger than the sum of its proper divisors (10660751).

111818809 is a wasteful number, since it uses less digits than its factorization.

111818809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226859.

The product of its (nonzero) digits is 4608, while the sum is 37.

The square root of 111818809 is about 10574.4413091189. The cubic root of 111818809 is about 481.7683743879.

The spelling of 111818809 in words is "one hundred eleven million, eight hundred eighteen thousand, eight hundred nine".