521801332 has 96 divisors (see below), whose sum is σ = 1121057280. Its totient is φ = 209848320.

The previous prime is 521801327. The next prime is 521801339. The reversal of 521801332 is 233108125.

It is a junction number, because it is equal to n+sod(n) for n = 521801297 and 521801306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521801339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 789082 + ... + 789742.

It is an arithmetic number, because the mean of its divisors is an integer number (11677680).

Almost surely, 2^521801332 is an apocalyptic number.

521801332 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

521801332 is an abundant number, since it is smaller than the sum of its proper divisors (599255948).

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

521801332 is a wasteful number, since it uses less digits than its factorization.

521801332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761 (or 759 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 521801332 is about 22842.9711727700. The cubic root of 521801332 is about 805.0726279906.

Adding to 521801332 its reverse (233108125), we get a palindrome (754909457).

The spelling of 521801332 in words is "five hundred twenty-one million, eight hundred one thousand, three hundred thirty-two".