11312111231 has 4 divisors (see below), whose sum is σ = 11379848592. Its totient is φ = 11244373872.

The previous prime is 11312111159. The next prime is 11312111243. The reversal of 11312111231 is 13211121311.

11312111231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11312111231 is a prime.

It is a super-2 number, since 2×11312111231² (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 (11312111131) 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 3 ways as a sum of consecutive naturals, for example, 33868430 + ... + 33868763.

It is an arithmetic number, because the mean of its divisors is an integer number (2844962148).

Almost surely, 2^11312111231 is an apocalyptic number.

11312111231 is a deficient number, since it is larger than the sum of its proper divisors (67737361).

11312111231 is an equidigital number, since it uses as much as digits as its factorization.

11312111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67737360.

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

Adding to 11312111231 its reverse (13211121311), we get a palindrome (24523232542).

The spelling of 11312111231 in words is "eleven billion, three hundred twelve million, one hundred eleven thousand, two hundred thirty-one".