513403321 has 4 divisors (see below), whose sum is σ = 514594944. Its totient is φ = 512211700.

The previous prime is 513403283. The next prime is 513403333. The reversal of 513403321 is 123304315.

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 513403321 - 2⁷ = 513403193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 513403292 and 513403301.

It is not an unprimeable number, because it can be changed into a prime (513403381) 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, 595165 + ... + 596026.

It is an arithmetic number, because the mean of its divisors is an integer number (128648736).

Almost surely, 2^513403321 is an apocalyptic number.

It is an amenable number.

513403321 is a deficient number, since it is larger than the sum of its proper divisors (1191623).

513403321 is a wasteful number, since it uses less digits than its factorization.

513403321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191622.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 513403321 is about 22658.4050850893. The cubic root of 513403321 is about 800.7302296073.

Adding to 513403321 its reverse (123304315), we get a palindrome (636707636).

The spelling of 513403321 in words is "five hundred thirteen million, four hundred three thousand, three hundred twenty-one".