216489065 has 16 divisors (see below), whose sum is σ = 281236368. Its totient is φ = 159031296.

The previous prime is 216489023. The next prime is 216489071. The reversal of 216489065 is 560984612.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 90421081 + 126067984 = 9509^2 + 11228^2 .

It is a cyclic number.

It is not a de Polignac number, because 216489065 - 2⁶ = 216489001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3917 + ... + 21173.

It is an arithmetic number, because the mean of its divisors is an integer number (17577273).

Almost surely, 2^216489065 is an apocalyptic number.

It is an amenable number.

216489065 is a deficient number, since it is larger than the sum of its proper divisors (64747303).

216489065 is a wasteful number, since it uses less digits than its factorization.

216489065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17468.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 216489065 is about 14713.5673784436. The cubic root of 216489065 is about 600.4524966219.

The spelling of 216489065 in words is "two hundred sixteen million, four hundred eighty-nine thousand, sixty-five".