521543632 has 20 divisors (see below), whose sum is σ = 1010844900. Its totient is φ = 260680448.

The previous prime is 521543621. The next prime is 521543639. The reversal of 521543632 is 236345125.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 84566416 + 436977216 = 9196^2 + 20904^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521543594 and 521543603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521543639) 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, 86244 + ... + 92092.

It is an arithmetic number, because the mean of its divisors is an integer number (50542245).

Almost surely, 2^521543632 is an apocalyptic number.

It is an amenable number.

521543632 is a deficient number, since it is larger than the sum of its proper divisors (489301268).

521543632 is a wasteful number, since it uses less digits than its factorization.

521543632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11430 (or 11424 counting only the distinct ones).

The product of its digits is 21600, while the sum is 31.

The square root of 521543632 is about 22837.3297913745. The cubic root of 521543632 is about 804.9400734681.

Adding to 521543632 its reverse (236345125), we get a palindrome (757888757).

The spelling of 521543632 in words is "five hundred twenty-one million, five hundred forty-three thousand, six hundred thirty-two".