231242823 has 32 divisors (see below), whose sum is σ = 414558720. Its totient is φ = 124364160.

The previous prime is 231242821. The next prime is 231242827. The reversal of 231242823 is 328242132.

231242823 is a `hidden beast` number, since 231 + 2 + 428 + 2 + 3 = 666.

It is not a de Polignac number, because 231242823 - 2¹ = 231242821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231242821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32773 + ... + 39198.

It is an arithmetic number, because the mean of its divisors is an integer number (12954960).

Almost surely, 2^231242823 is an apocalyptic number.

231242823 is a deficient number, since it is larger than the sum of its proper divisors (183315897).

231242823 is a wasteful number, since it uses less digits than its factorization.

231242823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72004 (or 71998 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 231242823 is about 15206.6703456082. The cubic root of 231242823 is about 613.7941631258.

Adding to 231242823 its reverse (328242132), we get a palindrome (559484955).

The spelling of 231242823 in words is "two hundred thirty-one million, two hundred forty-two thousand, eight hundred twenty-three".