231220524 has 12 divisors (see below), whose sum is σ = 539514584. Its totient is φ = 77073504.

The previous prime is 231220513. The next prime is 231220529. The reversal of 231220524 is 425022132.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 231220524.

It is not an unprimeable number, because it can be changed into a prime (231220529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9634177 + ... + 9634200.

Almost surely, 2^231220524 is an apocalyptic number.

It is an amenable number.

231220524 is an abundant number, since it is smaller than the sum of its proper divisors (308294060).

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

231220524 is a wasteful number, since it uses less digits than its factorization.

231220524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19268384 (or 19268382 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 231220524 is about 15205.9371299503. The cubic root of 231220524 is about 613.7744328760.

Adding to 231220524 its reverse (425022132), we get a palindrome (656242656).

The spelling of 231220524 in words is "two hundred thirty-one million, two hundred twenty thousand, five hundred twenty-four".