111691228 has 18 divisors (see below), whose sum is σ = 214845008. Its totient is φ = 50768520.

The previous prime is 111691219. The next prime is 111691231. The reversal of 111691228 is 822196111.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 111691228.

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 5 ways as a sum of consecutive naturals, for example, 114900 + ... + 115867.

Almost surely, 2^111691228 is an apocalyptic number.

It is an amenable number.

111691228 is a deficient number, since it is larger than the sum of its proper divisors (103153780).

111691228 is a wasteful number, since it uses less digits than its factorization.

111691228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230793 (or 230780 counting only the distinct ones).

The product of its digits is 1728, while the sum is 31.

The square root of 111691228 is about 10568.4070701312. The cubic root of 111691228 is about 481.5850782068.

The spelling of 111691228 in words is "one hundred eleven million, six hundred ninety-one thousand, two hundred twenty-eight".