12311131544 has 32 divisors (see below), whose sum is σ = 23477299200. Its totient is φ = 6050906400.

The previous prime is 12311131537. The next prime is 12311131577. The reversal of 12311131544 is 44513111321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232769 + ... + 280719.

It is an arithmetic number, because the mean of its divisors is an integer number (733665600).

Almost surely, 2^12311131544 is an apocalyptic number.

It is an amenable number.

12311131544 is a deficient number, since it is larger than the sum of its proper divisors (11166167656).

12311131544 is a wasteful number, since it uses less digits than its factorization.

12311131544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48503 (or 48499 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

Adding to 12311131544 its reverse (44513111321), we get a palindrome (56824242865).

The spelling of 12311131544 in words is "twelve billion, three hundred eleven million, one hundred thirty-one thousand, five hundred forty-four".