111231231 has 16 divisors (see below), whose sum is σ = 149666400. Its totient is φ = 73479168.

The previous prime is 111231209. The next prime is 111231233. The reversal of 111231231 is 132132111.

It is a happy number.

It is not a de Polignac number, because 111231231 - 2⁶ = 111231167 is a prime.

It is a super-2 number, since 2×111231231² = 24744773499550722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111231231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111231233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271755 + ... + 272163.

It is an arithmetic number, because the mean of its divisors is an integer number (9354150).

Almost surely, 2^111231231 is an apocalyptic number.

111231231 is a deficient number, since it is larger than the sum of its proper divisors (38435169).

111231231 is a wasteful number, since it uses less digits than its factorization.

111231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its digits is 36, while the sum is 15.

The square root of 111231231 is about 10546.6217814047. The cubic root of 111231231 is about 480.9230372350.

Adding to 111231231 its reverse (132132111), we get a palindrome (243363342).

The spelling of 111231231 in words is "one hundred eleven million, two hundred thirty-one thousand, two hundred thirty-one".