216513503 has 4 divisors (see below), whose sum is σ = 216543600. Its totient is φ = 216483408.

The previous prime is 216513487. The next prime is 216513509. The reversal of 216513503 is 305315612.

It is a semiprime because it is the product of two primes, 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 216513503 - 2⁴ = 216513487 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 (216513509) 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, 2798 + ... + 20996.

It is an arithmetic number, because the mean of its divisors is an integer number (54135900).

Almost surely, 2^216513503 is an apocalyptic number.

216513503 is a deficient number, since it is larger than the sum of its proper divisors (30097).

216513503 is a wasteful number, since it uses less digits than its factorization.

216513503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30096.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 216513503 is about 14714.3978130265. The cubic root of 216513503 is about 600.4750894581.

The spelling of 216513503 in words is "two hundred sixteen million, five hundred thirteen thousand, five hundred three".