513116521 has 4 divisors (see below), whose sum is σ = 513811600. Its totient is φ = 512421444.

The previous prime is 513116497. The next prime is 513116551. The reversal of 513116521 is 125611315.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 513116521 - 2⁷ = 513116393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513116551) 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, 346431 + ... + 347908.

It is an arithmetic number, because the mean of its divisors is an integer number (128452900).

Almost surely, 2^513116521 is an apocalyptic number.

It is an amenable number.

513116521 is a deficient number, since it is larger than the sum of its proper divisors (695079).

513116521 is an equidigital number, since it uses as much as digits as its factorization.

513116521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695078.

The product of its digits is 900, while the sum is 25.

The square root of 513116521 is about 22652.0754236781. The cubic root of 513116521 is about 800.5810991567.

Adding to 513116521 its reverse (125611315), we get a palindrome (638727836).

The spelling of 513116521 in words is "five hundred thirteen million, one hundred sixteen thousand, five hundred twenty-one".