12131311 has 4 divisors (see below), whose sum is σ = 12389472. Its totient is φ = 11873152.

The previous prime is 12131303. The next prime is 12131321. The reversal of 12131311 is 11313121.

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 12131311 - 2³ = 12131303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12131291 and 12131300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131321) 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, 129010 + ... + 129103.

It is an arithmetic number, because the mean of its divisors is an integer number (3097368).

Almost surely, 2^12131311 is an apocalyptic number.

12131311 is a deficient number, since it is larger than the sum of its proper divisors (258161).

12131311 is an equidigital number, since it uses as much as digits as its factorization.

12131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258160.

The product of its digits is 18, while the sum is 13.

The square root of 12131311 is about 3483.0031581955. The cubic root of 12131311 is about 229.7748963325.

Adding to 12131311 its reverse (11313121), we get a palindrome (23444432).

It can be divided in two parts, 1 and 2131311, that added together give a palindrome (2131312).

The spelling of 12131311 in words is "twelve million, one hundred thirty-one thousand, three hundred eleven".