13231131111 has 48 divisors (see below), whose sum is σ = 22240834560. Its totient is φ = 7760134800.

The previous prime is 13231131107. The next prime is 13231131149. The reversal of 13231131111 is 11113113231.

13231131111 is a `hidden beast` number, since 1 + 32 + 311 + 311 + 11 = 666.

It is not a de Polignac number, because 13231131111 - 2² = 13231131107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231131101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35956 + ... + 166598.

It is an arithmetic number, because the mean of its divisors is an integer number (463350720).

Almost surely, 2^13231131111 is an apocalyptic number.

13231131111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13231131111 is a deficient number, since it is larger than the sum of its proper divisors (9009703449).

13231131111 is a wasteful number, since it uses less digits than its factorization.

13231131111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130705 (or 130688 counting only the distinct ones).

The product of its digits is 54, while the sum is 18.

Adding to 13231131111 its reverse (11113113231), we get a palindrome (24344244342).

The spelling of 13231131111 in words is "thirteen billion, two hundred thirty-one million, one hundred thirty-one thousand, one hundred eleven".