231523420 has 24 divisors (see below), whose sum is σ = 487273248. Its totient is φ = 92404800.

The previous prime is 231523361. The next prime is 231523421. The reversal of 231523420 is 24325132.

231523420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231523391 and 231523400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231523421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336 + ... + 21775.

It is an arithmetic number, because the mean of its divisors is an integer number (20303052).

Almost surely, 2^231523420 is an apocalyptic number.

231523420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231523420 is an abundant number, since it is smaller than the sum of its proper divisors (255749828).

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

231523420 is a wasteful number, since it uses less digits than its factorization.

231523420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25581 (or 25579 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 231523420 is about 15215.8936641921. The cubic root of 231523420 is about 614.0423282118.

Adding to 231523420 its reverse (24325132), we get a palindrome (255848552).

The spelling of 231523420 in words is "two hundred thirty-one million, five hundred twenty-three thousand, four hundred twenty".