521145232 has 10 divisors (see below), whose sum is σ = 1009718918. Its totient is φ = 260572608.

The previous prime is 521145223. The next prime is 521145239. The reversal of 521145232 is 232541125.

It can be written as a sum of positive squares in only one way, i.e., 458987776 + 62157456 = 21424^2 + 7884^2 .

It is a junction number, because it is equal to n+sod(n) for n = 521145197 and 521145206.

It is not an unprimeable number, because it can be changed into a prime (521145239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16285773 + ... + 16285804.

Almost surely, 2^521145232 is an apocalyptic number.

It is an amenable number.

521145232 is a deficient number, since it is larger than the sum of its proper divisors (488573686).

521145232 is a wasteful number, since it uses less digits than its factorization.

521145232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32571585 (or 32571579 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 521145232 is about 22828.6055640725. The cubic root of 521145232 is about 804.7350603770.

Adding to 521145232 its reverse (232541125), we get a palindrome (753686357).

The spelling of 521145232 in words is "five hundred twenty-one million, one hundred forty-five thousand, two hundred thirty-two".