11111323231 has 2 divisors, whose sum is σ = 11111323232. Its totient is φ = 11111323230.

The previous prime is 11111323217. The next prime is 11111323259. The reversal of 11111323231 is 13232311111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11111323231 - 2¹⁷ = 11111192159 is a prime.

It is a super-2 number, since 2×11111323231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11111323199 and 11111323208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111323261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555661615 + 5555661616.

It is an arithmetic number, because the mean of its divisors is an integer number (5555661616).

Almost surely, 2^11111323231 is an apocalyptic number.

11111323231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111323231 is an equidigital number, since it uses as much as digits as its factorization.

11111323231 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 11111323231 its reverse (13232311111), we get a palindrome (24343634342).

The spelling of 11111323231 in words is "eleven billion, one hundred eleven million, three hundred twenty-three thousand, two hundred thirty-one".