12111231 has 8 divisors (see below), whose sum is σ = 17616384. Its totient is φ = 7340120.

The previous prime is 12111221. The next prime is 12111263. The reversal of 12111231 is 13211121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12111231 - 2⁵ = 12111199 is a prime.

It is a super-2 number, since 2×12111231² = 293363832670722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183471 + ... + 183536.

It is an arithmetic number, because the mean of its divisors is an integer number (2202048).

Almost surely, 2^12111231 is an apocalyptic number.

12111231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12111231 is a deficient number, since it is larger than the sum of its proper divisors (5505153).

12111231 is a wasteful number, since it uses less digits than its factorization.

12111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367021.

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

The square root of 12111231 is about 3480.1193945036. The cubic root of 12111231 is about 229.6480502473.

Adding to 12111231 its reverse (13211121), we get a palindrome (25322352).

It can be divided in two parts, 1211 and 1231, that added together give a palindrome (2442).

The spelling of 12111231 in words is "twelve million, one hundred eleven thousand, two hundred thirty-one".