12131231311 has 4 divisors (see below), whose sum is σ = 12131873824. Its totient is φ = 12130588800.

The previous prime is 12131231293. The next prime is 12131231339. The reversal of 12131231311 is 11313213121.

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

It is a 7-Lehmer number, since φ(12131231311) divides (12131231311-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 12131231311 - 2²³ = 12122842703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131231341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292050 + ... + 330991.

It is an arithmetic number, because the mean of its divisors is an integer number (3032968456).

Almost surely, 2^12131231311 is an apocalyptic number.

12131231311 is a deficient number, since it is larger than the sum of its proper divisors (642513).

12131231311 is an equidigital number, since it uses as much as digits as its factorization.

12131231311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642512.

The product of its digits is 108, while the sum is 19.

Adding to 12131231311 its reverse (11313213121), we get a palindrome (23444444432).

The spelling of 12131231311 in words is "twelve billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred eleven".