231213424 has 40 divisors (see below), whose sum is σ = 490371392. Its totient is φ = 104958720.

The previous prime is 231213397. The next prime is 231213439. The reversal of 231213424 is 424312132.

It is a junction number, because it is equal to n+sod(n) for n = 231213395 and 231213404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3577 + ... + 21799.

Almost surely, 2^231213424 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 231213424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245185696).

231213424 is an abundant number, since it is smaller than the sum of its proper divisors (259157968).

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

231213424 is a wasteful number, since it uses less digits than its factorization.

231213424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18305 (or 18299 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 231213424 is about 15205.7036667166. The cubic root of 231213424 is about 613.7681504996.

Adding to 231213424 its reverse (424312132), we get a palindrome (655525556).

The spelling of 231213424 in words is "two hundred thirty-one million, two hundred thirteen thousand, four hundred twenty-four".