11121311231 has 2 divisors, whose sum is σ = 11121311232. Its totient is φ = 11121311230.

The previous prime is 11121311207. The next prime is 11121311261. The reversal of 11121311231 is 13211312111.

It is a weak prime.

It is an emirp because it is prime and its reverse (13211312111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11121311231 is a prime.

It is a super-2 number, since 2×11121311231² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11121311261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5560655615 + 5560655616.

It is an arithmetic number, because the mean of its divisors is an integer number (5560655616).

Almost surely, 2^11121311231 is an apocalyptic number.

11121311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11121311231 is an equidigital number, since it uses as much as digits as its factorization.

11121311231 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11121311231 its reverse (13211312111), we get a palindrome (24332623342).

The spelling of 11121311231 in words is "eleven billion, one hundred twenty-one million, three hundred eleven thousand, two hundred thirty-one".