521332813 has 8 divisors (see below), whose sum is σ = 525813120. Its totient is φ = 516862560.

The previous prime is 521332807. The next prime is 521332853. The reversal of 521332813 is 318233125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521332813 - 2¹³ = 521324621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521332853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131068 + ... + 134986.

It is an arithmetic number, because the mean of its divisors is an integer number (65726640).

Almost surely, 2^521332813 is an apocalyptic number.

It is an amenable number.

521332813 is a deficient number, since it is larger than the sum of its proper divisors (4480307).

521332813 is a wasteful number, since it uses less digits than its factorization.

521332813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027.

The product of its digits is 4320, while the sum is 28.

The square root of 521332813 is about 22832.7136582580. The cubic root of 521332813 is about 804.8316009000.

Adding to 521332813 its reverse (318233125), we get a palindrome (839565938).

It can be divided in two parts, 52133 and 2813, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 521332813 in words is "five hundred twenty-one million, three hundred thirty-two thousand, eight hundred thirteen".