12243131 has 4 divisors (see below), whose sum is σ = 12263592. Its totient is φ = 12222672.

The previous prime is 12243113. The next prime is 12243139. The reversal of 12243131 is 13134221.

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

It is a cyclic number.

It is not a de Polignac number, because 12243131 - 2¹⁰ = 12242107 is a prime.

It is a super-2 number, since 2×12243131² = 299788513366322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12243139) 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, 9305 + ... + 10538.

It is an arithmetic number, because the mean of its divisors is an integer number (3065898).

Almost surely, 2^12243131 is an apocalyptic number.

12243131 is a deficient number, since it is larger than the sum of its proper divisors (20461).

12243131 is an equidigital number, since it uses as much as digits as its factorization.

12243131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20460.

The product of its digits is 144, while the sum is 17.

The square root of 12243131 is about 3499.0185766869. The cubic root of 12243131 is about 230.4787193539.

Adding to 12243131 its reverse (13134221), we get a palindrome (25377352).

The spelling of 12243131 in words is "twelve million, two hundred forty-three thousand, one hundred thirty-one".