216308503 has 4 divisors (see below), whose sum is σ = 217073128. Its totient is φ = 215543880.

The previous prime is 216308489. The next prime is 216308539. The reversal of 216308503 is 305803612.

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 216308503 - 2⁵ = 216308471 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 (216318503) 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, 381888 + ... + 382453.

It is an arithmetic number, because the mean of its divisors is an integer number (54268282).

Almost surely, 2^216308503 is an apocalyptic number.

216308503 is a deficient number, since it is larger than the sum of its proper divisors (764625).

216308503 is an equidigital number, since it uses as much as digits as its factorization.

216308503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764624.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 216308503 is about 14707.4301970127. The cubic root of 216308503 is about 600.2855150396.

It can be divided in two parts, 216308 and 503, that added together give a triangular number (216811 = T₆₅₈).

The spelling of 216308503 in words is "two hundred sixteen million, three hundred eight thousand, five hundred three".