513000503 has 4 divisors (see below), whose sum is σ = 514280208. Its totient is φ = 511720800.

The previous prime is 513000497. The next prime is 513000511. The reversal of 513000503 is 305000315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 513000503 - 2¹⁰ = 512999479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513000203) 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, 639251 + ... + 640052.

It is an arithmetic number, because the mean of its divisors is an integer number (128570052).

Almost surely, 2^513000503 is an apocalyptic number.

513000503 is a deficient number, since it is larger than the sum of its proper divisors (1279705).

513000503 is a wasteful number, since it uses less digits than its factorization.

513000503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279704.

The product of its (nonzero) digits is 225, while the sum is 17.

The square root of 513000503 is about 22649.5144098058. The cubic root of 513000503 is about 800.5207562551.

Adding to 513000503 its reverse (305000315), we get a palindrome (818000818).

The spelling of 513000503 in words is "five hundred thirteen million, five hundred three", and thus it is an aban number.