521324404 has 6 divisors (see below), whose sum is σ = 912317714. Its totient is φ = 260662200.

The previous prime is 521324399. The next prime is 521324429. The reversal of 521324404 is 404423125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 272316004 + 249008400 = 16502^2 + 15780^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65165547 + ... + 65165554.

Almost surely, 2^521324404 is an apocalyptic number.

It is an amenable number.

521324404 is a deficient number, since it is larger than the sum of its proper divisors (390993310).

521324404 is a wasteful number, since it uses less digits than its factorization.

521324404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130331105 (or 130331103 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 521324404 is about 22832.5295138318. The cubic root of 521324404 is about 804.8272736160.

Adding to 521324404 its reverse (404423125), we get a palindrome (925747529).

The spelling of 521324404 in words is "five hundred twenty-one million, three hundred twenty-four thousand, four hundred four".