216541919 has 8 divisors (see below), whose sum is σ = 236472912. Its totient is φ = 196651840.

The previous prime is 216541909. The next prime is 216541921. The reversal of 216541919 is 919145612.

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

It is not a de Polignac number, because 216541919 - 2¹⁶ = 216476383 is a prime.

It is a super-3 number, since 3×216541919³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216541909) 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, 1427 + ... + 20859.

It is an arithmetic number, because the mean of its divisors is an integer number (29559114).

Almost surely, 2^216541919 is an apocalyptic number.

216541919 is a deficient number, since it is larger than the sum of its proper divisors (19930993).

216541919 is a wasteful number, since it uses less digits than its factorization.

216541919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20457.

The product of its digits is 19440, while the sum is 38.

The square root of 216541919 is about 14715.3633662238. The cubic root of 216541919 is about 600.5013578024.

The spelling of 216541919 in words is "two hundred sixteen million, five hundred forty-one thousand, nine hundred nineteen".