521117204 has 12 divisors (see below), whose sum is σ = 912176244. Its totient is φ = 260495424.

The previous prime is 521117203. The next prime is 521117231. The reversal of 521117204 is 402711125.

It can be written as a sum of positive squares in 2 ways, for example, as 363664900 + 157452304 = 19070^2 + 12548^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 521117204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521117203) 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, 6152 + ... + 32864.

It is an arithmetic number, because the mean of its divisors is an integer number (76014687).

Almost surely, 2^521117204 is an apocalyptic number.

It is an amenable number.

521117204 is a deficient number, since it is larger than the sum of its proper divisors (391059040).

521117204 is a wasteful number, since it uses less digits than its factorization.

521117204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31594 (or 31592 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 521117204 is about 22827.9916768865. The cubic root of 521117204 is about 804.7206334846.

Adding to 521117204 its reverse (402711125), we get a palindrome (923828329).

The spelling of 521117204 in words is "five hundred twenty-one million, one hundred seventeen thousand, two hundred four".