13115231811 has 12 divisors (see below), whose sum is σ = 20666426040. Its totient is φ = 7948625280.

The previous prime is 13115231797. The next prime is 13115231839. The reversal of 13115231811 is 11813251131.

13115231811 is a `hidden beast` number, since 131 + 1 + 523 + 1 + 8 + 1 + 1 = 666.

13115231811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13115231811 - 2⁹ = 13115231299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13115231911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66238446 + ... + 66238643.

It is an arithmetic number, because the mean of its divisors is an integer number (1722202170).

Almost surely, 2^13115231811 is an apocalyptic number.

13115231811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13115231811 is a deficient number, since it is larger than the sum of its proper divisors (7551194229).

13115231811 is a wasteful number, since it uses less digits than its factorization.

13115231811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132477106 (or 132477103 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

Adding to 13115231811 its reverse (11813251131), we get a palindrome (24928482942).

The spelling of 13115231811 in words is "thirteen billion, one hundred fifteen million, two hundred thirty-one thousand, eight hundred eleven".