11131231 has 2 divisors, whose sum is σ = 11131232. Its totient is φ = 11131230.

The previous prime is 11131229. The next prime is 11131247. The reversal of 11131231 is 13213111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11131231 - 2¹ = 11131229 is a prime.

It is a super-2 number, since 2×11131231² = 247808607150722, which contains 22 as substring.

Together with 11131229, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11131271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565615 + 5565616.

It is an arithmetic number, because the mean of its divisors is an integer number (5565616).

Almost surely, 2^11131231 is an apocalyptic number.

11131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131231 is an equidigital number, since it uses as much as digits as its factorization.

11131231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18, while the sum is 13.

The square root of 11131231 is about 3336.3499516687. The cubic root of 11131231 is about 223.2789246436.

Adding to 11131231 its reverse (13213111), we get a palindrome (24344342).

The spelling of 11131231 in words is "eleven million, one hundred thirty-one thousand, two hundred thirty-one".