11231131231 has 2 divisors, whose sum is σ = 11231131232. Its totient is φ = 11231131230.

The previous prime is 11231131207. The next prime is 11231131273. The reversal of 11231131231 is 13213113211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11231131231 - 2⁹ = 11231130719 is a prime.

It is a super-2 number, since 2×11231131231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11231131199 and 11231131208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231131291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615565615 + 5615565616.

It is an arithmetic number, because the mean of its divisors is an integer number (5615565616).

Almost surely, 2^11231131231 is an apocalyptic number.

11231131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231131231 is an equidigital number, since it uses as much as digits as its factorization.

11231131231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 19.

Adding to 11231131231 its reverse (13213113211), we get a palindrome (24444244442).

The spelling of 11231131231 in words is "eleven billion, two hundred thirty-one million, one hundred thirty-one thousand, two hundred thirty-one".