216187243 has 4 divisors (see below), whose sum is σ = 216220048. Its totient is φ = 216154440.

The previous prime is 216187241. The next prime is 216187267. The reversal of 216187243 is 342781612.

216187243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 216187243 - 2¹ = 216187241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216187199 and 216187208.

It is not an unprimeable number, because it can be changed into a prime (216187241) 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, 2703 + ... + 20968.

It is an arithmetic number, because the mean of its divisors is an integer number (54055012).

Almost surely, 2^216187243 is an apocalyptic number.

216187243 is a deficient number, since it is larger than the sum of its proper divisors (32805).

216187243 is an equidigital number, since it uses as much as digits as its factorization.

216187243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32804.

The product of its digits is 16128, while the sum is 34.

The square root of 216187243 is about 14703.3072130048. The cubic root of 216187243 is about 600.1733230752.

The spelling of 216187243 in words is "two hundred sixteen million, one hundred eighty-seven thousand, two hundred forty-three".