11131112231 has 4 divisors (see below), whose sum is σ = 11218758912. Its totient is φ = 11043465552.

The previous prime is 11131112207. The next prime is 11131112273. The reversal of 11131112231 is 13221113111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11131112231 - 2¹⁰ = 11131111207 is a prime.

It is a super-2 number, since 2×11131112231² (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 (11131112281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43823150 + ... + 43823403.

It is an arithmetic number, because the mean of its divisors is an integer number (2804689728).

Almost surely, 2^11131112231 is an apocalyptic number.

11131112231 is a deficient number, since it is larger than the sum of its proper divisors (87646681).

11131112231 is an equidigital number, since it uses as much as digits as its factorization.

11131112231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87646680.

The product of its digits is 36, while the sum is 17.

Adding to 11131112231 its reverse (13221113111), we get a palindrome (24352225342).

The spelling of 11131112231 in words is "eleven billion, one hundred thirty-one million, one hundred twelve thousand, two hundred thirty-one".