231520324 has 24 divisors (see below), whose sum is σ = 471780288. Its totient is φ = 97350240.

The previous prime is 231520321. The next prime is 231520327. The reversal of 231520324 is 423025132.

It is an interprime number because it is at equal distance from previous prime (231520321) and next prime (231520327).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 231520295 and 231520304.

It is not an unprimeable number, because it can be changed into a prime (231520321) 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, 76522 + ... + 79489.

It is an arithmetic number, because the mean of its divisors is an integer number (19657512).

Almost surely, 2^231520324 is an apocalyptic number.

It is an amenable number.

231520324 is an abundant number, since it is smaller than the sum of its proper divisors (240259964).

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

231520324 is a wasteful number, since it uses less digits than its factorization.

231520324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156075 (or 156073 counting only the distinct ones).

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

The square root of 231520324 is about 15215.7919281252. The cubic root of 231520324 is about 614.0395911475.

Adding to 231520324 its reverse (423025132), we get a palindrome (654545456).

The spelling of 231520324 in words is "two hundred thirty-one million, five hundred twenty thousand, three hundred twenty-four".