521340513 has 32 divisors (see below), whose sum is σ = 754790400. Its totient is φ = 318878976.

The previous prime is 521340509. The next prime is 521340527. The reversal of 521340513 is 315043125.

It is not a de Polignac number, because 521340513 - 2² = 521340509 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (521340583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333628 + ... + 335186.

It is an arithmetic number, because the mean of its divisors is an integer number (23587200).

Almost surely, 2^521340513 is an apocalyptic number.

It is an amenable number.

521340513 is a deficient number, since it is larger than the sum of its proper divisors (233449887).

521340513 is a wasteful number, since it uses less digits than its factorization.

521340513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 521340513 is about 22832.8822753502. The cubic root of 521340513 is about 804.8355632906.

Adding to 521340513 its reverse (315043125), we get a palindrome (836383638).

The spelling of 521340513 in words is "five hundred twenty-one million, three hundred forty thousand, five hundred thirteen".