11131331231 has 24 divisors (see below), whose sum is σ = 11733351552. Its totient is φ = 10557918000.

The previous prime is 11131331219. The next prime is 11131331297. The reversal of 11131331231 is 13213313111.

It is not a de Polignac number, because 11131331231 - 2¹⁸ = 11131069087 is a prime.

It is a super-2 number, since 2×11131331231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131331131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10590656 + ... + 10591706.

It is an arithmetic number, because the mean of its divisors is an integer number (488889648).

Almost surely, 2^11131331231 is an apocalyptic number.

11131331231 is a deficient number, since it is larger than the sum of its proper divisors (602020321).

11131331231 is a wasteful number, since it uses less digits than its factorization.

11131331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1292 counting only the distinct ones).

The product of its digits is 162, while the sum is 20.

Adding to 11131331231 its reverse (13213313111), we get a palindrome (24344644342).

The spelling of 11131331231 in words is "eleven billion, one hundred thirty-one million, three hundred thirty-one thousand, two hundred thirty-one".