521521332 has 12 divisors (see below), whose sum is σ = 1216883136. Its totient is φ = 173840440.

The previous prime is 521521331. The next prime is 521521361. The reversal of 521521332 is 233125125.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521521331) 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, 21730044 + ... + 21730067.

It is an arithmetic number, because the mean of its divisors is an integer number (101406928).

Almost surely, 2^521521332 is an apocalyptic number.

It is an amenable number.

521521332 is an abundant number, since it is smaller than the sum of its proper divisors (695361804).

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

521521332 is a wasteful number, since it uses less digits than its factorization.

521521332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43460118 (or 43460116 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 521521332 is about 22836.8415504421. The cubic root of 521521332 is about 804.9286008457.

Adding to 521521332 its reverse (233125125), we get a palindrome (754646457).

The spelling of 521521332 in words is "five hundred twenty-one million, five hundred twenty-one thousand, three hundred thirty-two".