521304641 has 16 divisors (see below), whose sum is σ = 613394880. Its totient is φ = 436777920.

The previous prime is 521304631. The next prime is 521304659. The reversal of 521304641 is 146403125.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521304641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 521304641.

It is not an unprimeable number, because it can be changed into a prime (521304611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103211 + ... + 108143.

It is an arithmetic number, because the mean of its divisors is an integer number (38337180).

Almost surely, 2^521304641 is an apocalyptic number.

It is an amenable number.

521304641 is a deficient number, since it is larger than the sum of its proper divisors (92090239).

521304641 is a wasteful number, since it uses less digits than its factorization.

521304641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5696.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 521304641 is about 22832.0967280712. The cubic root of 521304641 is about 804.8171033636.

Adding to 521304641 its reverse (146403125), we get a palindrome (667707766).

The spelling of 521304641 in words is "five hundred twenty-one million, three hundred four thousand, six hundred forty-one".