111312128 has 18 divisors (see below), whose sum is σ = 222189954. Its totient is φ = 55655936.

The previous prime is 111312109. The next prime is 111312133. The reversal of 111312128 is 821213111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 110838784 + 473344 = 10528^2 + 688^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217151 + ... + 217662.

Almost surely, 2^111312128 is an apocalyptic number.

It is an amenable number.

111312128 is a deficient number, since it is larger than the sum of its proper divisors (110877826).

111312128 is an frugal number, since it uses more digits than its factorization.

111312128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434829 (or 434815 counting only the distinct ones).

The product of its digits is 96, while the sum is 20.

The square root of 111312128 is about 10550.4562934501. The cubic root of 111312128 is about 481.0395986319.

Adding to 111312128 its reverse (821213111), we get a palindrome (932525239).

The spelling of 111312128 in words is "one hundred eleven million, three hundred twelve thousand, one hundred twenty-eight".