521522232 has 128 divisors (see below), whose sum is σ = 1663580160. Its totient is φ = 132289920.

The previous prime is 521522153. The next prime is 521522251. The reversal of 521522232 is 232225125.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76183 + ... + 82745.

It is an arithmetic number, because the mean of its divisors is an integer number (12996720).

Almost surely, 2^521522232 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 521522232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (831790080).

521522232 is an abundant number, since it is smaller than the sum of its proper divisors (1142057928).

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

521522232 is a wasteful number, since it uses less digits than its factorization.

521522232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6633 (or 6629 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 521522232 is about 22836.8612554353. The cubic root of 521522232 is about 804.9290638727.

Adding to 521522232 its reverse (232225125), we get a palindrome (753747357).

It can be divided in two parts, 521 and 522232, that added together give a triangular number (522753 = T₁₀₂₂).

The spelling of 521522232 in words is "five hundred twenty-one million, five hundred twenty-two thousand, two hundred thirty-two".