12013231 has 4 divisors (see below), whose sum is σ = 12022264. Its totient is φ = 12004200.

The previous prime is 12013229. The next prime is 12013259. The reversal of 12013231 is 13231021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13231021 = 439 ⋅30139.

It is a cyclic number.

It is not a de Polignac number, because 12013231 - 2¹ = 12013229 is a prime.

It is a super-2 number, since 2×12013231² = 288635438118722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013201) 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, 2085 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (3005566).

Almost surely, 2^12013231 is an apocalyptic number.

12013231 is a deficient number, since it is larger than the sum of its proper divisors (9033).

12013231 is an equidigital number, since it uses as much as digits as its factorization.

12013231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9032.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12013231 is about 3466.0108193715. The cubic root of 12013231 is about 229.0269604611.

Adding to 12013231 its reverse (13231021), we get a palindrome (25244252).

The spelling of 12013231 in words is "twelve million, thirteen thousand, two hundred thirty-one".