521613432 has 80 divisors (see below), whose sum is σ = 1464269400. Its totient is φ = 173482560.

The previous prime is 521613419. The next prime is 521613487. The reversal of 521613432 is 234316125.

521613432 is a `hidden beast` number, since 5 + 2 + 1 + 613 + 43 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 521613396 and 521613405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 536707 + ... + 537677.

Almost surely, 2^521613432 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 521613432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732134700).

521613432 is an abundant number, since it is smaller than the sum of its proper divisors (942655968).

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

521613432 is a wasteful number, since it uses less digits than its factorization.

521613432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818 (or 1805 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 521613432 is about 22838.8579399234. The cubic root of 521613432 is about 804.9759811771.

Adding to 521613432 its reverse (234316125), we get a palindrome (755929557).

The spelling of 521613432 in words is "five hundred twenty-one million, six hundred thirteen thousand, four hundred thirty-two".