111131406 has 32 divisors (see below), whose sum is σ = 252218880. Its totient is φ = 36254808.

The previous prime is 111131369. The next prime is 111131429. The reversal of 111131406 is 604131111.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19356 + ... + 24431.

It is an arithmetic number, because the mean of its divisors is an integer number (7881840).

Almost surely, 2^111131406 is an apocalyptic number.

111131406 is an abundant number, since it is smaller than the sum of its proper divisors (141087474).

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

111131406 is a wasteful number, since it uses less digits than its factorization.

111131406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43845 (or 43839 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 111131406 is about 10541.8881610459. Note that the first 3 decimals coincide. The cubic root of 111131406 is about 480.7791252820.

Adding to 111131406 its reverse (604131111), we get a palindrome (715262517).

The spelling of 111131406 in words is "one hundred eleven million, one hundred thirty-one thousand, four hundred six".