513220403 has 8 divisors (see below), whose sum is σ = 519763200. Its totient is φ = 506717640.

The previous prime is 513220399. The next prime is 513220417. The reversal of 513220403 is 304022315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 513220403 - 2² = 513220399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513222403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16226 + ... + 35912.

It is an arithmetic number, because the mean of its divisors is an integer number (64970400).

Almost surely, 2^513220403 is an apocalyptic number.

513220403 is a deficient number, since it is larger than the sum of its proper divisors (6542797).

513220403 is a wasteful number, since it uses less digits than its factorization.

513220403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20017.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 513220403 is about 22654.3682984099. The cubic root of 513220403 is about 800.6351222038.

Adding to 513220403 its reverse (304022315), we get a palindrome (817242718).

The spelling of 513220403 in words is "five hundred thirteen million, two hundred twenty thousand, four hundred three".