111431144 has 16 divisors (see below), whose sum is σ = 227927520. Its totient is φ = 50650480.

The previous prime is 111431129. The next prime is 111431167. The reversal of 111431144 is 441134111.

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, 633044 + ... + 633219.

It is an arithmetic number, because the mean of its divisors is an integer number (14245470).

Almost surely, 2^111431144 is an apocalyptic number.

It is an amenable number.

111431144 is an abundant number, since it is smaller than the sum of its proper divisors (116496376).

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

111431144 is a wasteful number, since it uses less digits than its factorization.

111431144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266280 (or 1266276 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 111431144 is about 10556.0951113563. The cubic root of 111431144 is about 481.2109816232.

Adding to 111431144 its reverse (441134111), we get a palindrome (552565255).

The spelling of 111431144 in words is "one hundred eleven million, four hundred thirty-one thousand, one hundred forty-four".