111431111 has 4 divisors (see below), whose sum is σ = 121561224. Its totient is φ = 101301000.

The previous prime is 111431077. The next prime is 111431129. The reversal of 111431111 is 111134111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111431111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111431911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5065040 + ... + 5065061.

It is an arithmetic number, because the mean of its divisors is an integer number (30390306).

Almost surely, 2^111431111 is an apocalyptic number.

111431111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111431111 is a deficient number, since it is larger than the sum of its proper divisors (10130113).

111431111 is a wasteful number, since it uses less digits than its factorization.

111431111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10130112.

The product of its digits is 12, while the sum is 14.

The square root of 111431111 is about 10556.0935482782. The cubic root of 111431111 is about 481.2109341202.

Adding to 111431111 its reverse (111134111), we get a palindrome (222565222).

The spelling of 111431111 in words is "one hundred eleven million, four hundred thirty-one thousand, one hundred eleven".