231111823 has 2 divisors, whose sum is σ = 231111824. Its totient is φ = 231111822.

The previous prime is 231111773. The next prime is 231111827. The reversal of 231111823 is 328111132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231111823 - 2²¹ = 229014671 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231111794 and 231111803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231111827) 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 as a sum of consecutive naturals, namely, 115555911 + 115555912.

It is an arithmetic number, because the mean of its divisors is an integer number (115555912).

Almost surely, 2^231111823 is an apocalyptic number.

231111823 is a deficient number, since it is larger than the sum of its proper divisors (1).

231111823 is an equidigital number, since it uses as much as digits as its factorization.

231111823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 231111823 is about 15202.3624150985. The cubic root of 231111823 is about 613.6782356018.

Adding to 231111823 its reverse (328111132), we get a palindrome (559222955).

The spelling of 231111823 in words is "two hundred thirty-one million, one hundred eleven thousand, eight hundred twenty-three".