521231232 has 64 divisors (see below), whose sum is σ = 1387330560. Its totient is φ = 173391360.

The previous prime is 521231197. The next prime is 521231233. The reversal of 521231232 is 232132125.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 521231199 and 521231208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521231233) 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, 245857 + ... + 247967.

It is an arithmetic number, because the mean of its divisors is an integer number (21677040).

Almost surely, 2^521231232 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 521231232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (693665280).

521231232 is an abundant number, since it is smaller than the sum of its proper divisors (866099328).

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

521231232 is a wasteful number, since it uses less digits than its factorization.

521231232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771 (or 2759 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 521231232 is about 22830.4890880594. The cubic root of 521231232 is about 804.7793240515.

Adding to 521231232 its reverse (232132125), we get a palindrome (753363357).

The spelling of 521231232 in words is "five hundred twenty-one million, two hundred thirty-one thousand, two hundred thirty-two".