111231 has 12 divisors (see below), whose sum is σ = 170352. Its totient is φ = 69696.

The previous prime is 111229. The next prime is 111253. The reversal of 111231 is 132111.

It is not a de Polignac number, because 111231 - 2¹ = 111229 is a prime.

It is a super-2 number, since 2×111231² = 24744670722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a zygodrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211 + ... + 516.

It is an arithmetic number, because the mean of its divisors is an integer number (14196).

2¹¹¹²³¹ is an apocalyptic number.

111231 is a deficient number, since it is larger than the sum of its proper divisors (59121).

111231 is a wasteful number, since it uses less digits than its factorization.

111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 747 counting only the distinct ones).

The product of its digits is 6, while the sum is 9.

The square root of 111231 is about 333.5131181828. The cubic root of 111231 is about 48.0922704315.

Adding to 111231 its reverse (132111), we get a palindrome (243342).

The spelling of 111231 in words is "one hundred eleven thousand, two hundred thirty-one".