111431345 has 16 divisors (see below), whose sum is σ = 142162128. Its totient is φ = 83558400.

The previous prime is 111431321. The next prime is 111431377. The reversal of 111431345 is 543134111.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 65536 + 111365809 = 256^2 + 10553^2 .

It is not a de Polignac number, because 111431345 - 2¹⁰ = 111430321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111431345.

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 15 ways as a sum of consecutive naturals, for example, 19295 + ... + 24395.

It is an arithmetic number, because the mean of its divisors is an integer number (8885133).

Almost surely, 2^111431345 is an apocalyptic number.

It is an amenable number.

111431345 is a deficient number, since it is larger than the sum of its proper divisors (30730783).

111431345 is a wasteful number, since it uses less digits than its factorization.

111431345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380.

The product of its digits is 720, while the sum is 23.

The square root of 111431345 is about 10556.1046319180. The cubic root of 111431345 is about 481.2112709599.

Adding to 111431345 its reverse (543134111), we get a palindrome (654565456).

The spelling of 111431345 in words is "one hundred eleven million, four hundred thirty-one thousand, three hundred forty-five".