111553686 has 80 divisors (see below), whose sum is σ = 261824640. Its totient is φ = 35458560.

The previous prime is 111553679. The next prime is 111553721. The reversal of 111553686 is 686355111.

111553686 is a `hidden beast` number, since 1 + 115 + 536 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 111553686.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 487020 + ... + 487248.

It is an arithmetic number, because the mean of its divisors is an integer number (3272808).

Almost surely, 2^111553686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111553686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130912320).

111553686 is an abundant number, since it is smaller than the sum of its proper divisors (150270954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111553686 is a wasteful number, since it uses less digits than its factorization.

111553686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 111553686 is about 10561.8978408239. The cubic root of 111553686 is about 481.3873145917.

It can be divided in two parts, 11155 and 3686, that added together give a palindrome (14841).

The spelling of 111553686 in words is "one hundred eleven million, five hundred fifty-three thousand, six hundred eighty-six".