216941865 has 96 divisors (see below), whose sum is σ = 432988416. Its totient is φ = 92252160.

The previous prime is 216941863. The next prime is 216941869. The reversal of 216941865 is 568149612.

216941865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216941865 - 2¹ = 216941863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216941863) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 692949 + ... + 693261.

It is an arithmetic number, because the mean of its divisors is an integer number (4510296).

Almost surely, 2^216941865 is an apocalyptic number.

It is an amenable number.

216941865 is a deficient number, since it is larger than the sum of its proper divisors (216046551).

216941865 is a wasteful number, since it uses less digits than its factorization.

216941865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 392 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 216941865 is about 14728.9465000047. The cubic root of 216941865 is about 600.8708326948.

The spelling of 216941865 in words is "two hundred sixteen million, nine hundred forty-one thousand, eight hundred sixty-five".