503311321 has 4 divisors (see below), whose sum is σ = 503363200. Its totient is φ = 503259444.

The previous prime is 503311313. The next prime is 503311331. The reversal of 503311321 is 123113305.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 503311321 - 2³ = 503311313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (503311331) 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, 6561 + ... + 32398.

It is an arithmetic number, because the mean of its divisors is an integer number (125840800).

Almost surely, 2^503311321 is an apocalyptic number.

It is an amenable number.

503311321 is a deficient number, since it is larger than the sum of its proper divisors (51879).

503311321 is a wasteful number, since it uses less digits than its factorization.

503311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51878.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 503311321 is about 22434.6009770622. The cubic root of 503311321 is about 795.4488037190.

Adding to 503311321 its reverse (123113305), we get a palindrome (626424626).

The spelling of 503311321 in words is "five hundred three million, three hundred eleven thousand, three hundred twenty-one".