521311264 has 12 divisors (see below), whose sum is σ = 1026331614. Its totient is φ = 260655616.

The previous prime is 521311253. The next prime is 521311267. The reversal of 521311264 is 462113125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 265950864 + 255360400 = 16308^2 + 15980^2 .

It is not an unprimeable number, because it can be changed into a prime (521311267) 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, 8145457 + ... + 8145520.

Almost surely, 2^521311264 is an apocalyptic number.

It is an amenable number.

521311264 is a deficient number, since it is larger than the sum of its proper divisors (505020350).

521311264 is a wasteful number, since it uses less digits than its factorization.

521311264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16290987 (or 16290979 counting only the distinct ones).

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

The square root of 521311264 is about 22832.2417646625. The cubic root of 521311264 is about 804.8205116593.

Adding to 521311264 its reverse (462113125), we get a palindrome (983424389).

The spelling of 521311264 in words is "five hundred twenty-one million, three hundred eleven thousand, two hundred sixty-four".