513503243321 has 4 divisors (see below), whose sum is σ = 515805948672. Its totient is φ = 511200537972.

The previous prime is 513503243311. The next prime is 513503243327. The reversal of 513503243321 is 123342305315.

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 a de Polignac number, because none of the positive numbers 2^k-513503243321 is a prime.

It is a super-2 number, since 2×513503243321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513503243327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1151352341 + ... + 1151352786.

It is an arithmetic number, because the mean of its divisors is an integer number (128951487168).

Almost surely, 2^513503243321 is an apocalyptic number.

It is an amenable number.

513503243321 is a deficient number, since it is larger than the sum of its proper divisors (2302705351).

513503243321 is a wasteful number, since it uses less digits than its factorization.

513503243321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302705350.

The product of its (nonzero) digits is 32400, while the sum is 32.

Adding to 513503243321 its reverse (123342305315), we get a palindrome (636845548636).

The spelling of 513503243321 in words is "five hundred thirteen billion, five hundred three million, two hundred forty-three thousand, three hundred twenty-one".