216541047 has 8 divisors (see below), whose sum is σ = 289496944. Its totient is φ = 143972928.

The previous prime is 216541037. The next prime is 216541063. The reversal of 216541047 is 740145612.

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

It is not a de Polignac number, because 216541047 - 2¹⁸ = 216278903 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 (216541027) 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, 95638 + ... + 97875.

It is an arithmetic number, because the mean of its divisors is an integer number (36187118).

Almost surely, 2^216541047 is an apocalyptic number.

216541047 is a deficient number, since it is larger than the sum of its proper divisors (72955897).

216541047 is a wasteful number, since it uses less digits than its factorization.

216541047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193889.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 216541047 is about 14715.3337372959. Note that the first 3 decimals coincide. The cubic root of 216541047 is about 600.5005517416.

Adding to 216541047 its reverse (740145612), we get a palindrome (956686659).

The spelling of 216541047 in words is "two hundred sixteen million, five hundred forty-one thousand, forty-seven".