231111424 has 72 divisors (see below), whose sum is σ = 479546928. Its totient is φ = 111083520.

The previous prime is 231111409. The next prime is 231111427. The reversal of 231111424 is 424111132.

231111424 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (231111427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017999 + ... + 1018225.

It is an arithmetic number, because the mean of its divisors is an integer number (6660374).

Almost surely, 2^231111424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231111424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239773464).

231111424 is an abundant number, since it is smaller than the sum of its proper divisors (248435504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231111424 is an equidigital number, since it uses as much as digits as its factorization.

231111424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381 (or 367 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 231111424 is about 15202.3492921324. The cubic root of 231111424 is about 613.6778824426.

Adding to 231111424 its reverse (424111132), we get a palindrome (655222556).

The spelling of 231111424 in words is "two hundred thirty-one million, one hundred eleven thousand, four hundred twenty-four".