11131231111 has 32 divisors (see below), whose sum is σ = 15732057600. Its totient is φ = 7585073280.

The previous prime is 11131231093. The next prime is 11131231123. The reversal of 11131231111 is 11113213111.

It is a cyclic number.

It is not a de Polignac number, because 11131231111 - 2²⁵ = 11097676679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131231141) 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 31 ways as a sum of consecutive naturals, for example, 273616 + ... + 311653.

It is an arithmetic number, because the mean of its divisors is an integer number (491626800).

Almost surely, 2^11131231111 is an apocalyptic number.

11131231111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11131231111 is a deficient number, since it is larger than the sum of its proper divisors (4600826489).

11131231111 is a wasteful number, since it uses less digits than its factorization.

11131231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585319.

The product of its digits is 18, while the sum is 16.

Adding to 11131231111 its reverse (11113213111), we get a palindrome (22244444222).

It can be divided in two parts, 11131 and 231111, that added together give a palindrome (242242).

The spelling of 11131231111 in words is "eleven billion, one hundred thirty-one million, two hundred thirty-one thousand, one hundred eleven".