216846689 has 2 divisors, whose sum is σ = 216846690. Its totient is φ = 216846688.

The previous prime is 216846683. The next prime is 216846731. The reversal of 216846689 is 986648612.

It is a happy number.

216846689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117505600 + 99341089 = 10840^2 + 9967^2 .

It is a cyclic number.

It is not a de Polignac number, because 216846689 - 2²⁴ = 200069473 is a prime.

It is not a weakly prime, because it can be changed into another prime (216846683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108423344 + 108423345.

It is an arithmetic number, because the mean of its divisors is an integer number (108423345).

Almost surely, 2^216846689 is an apocalyptic number.

It is an amenable number.

216846689 is a deficient number, since it is larger than the sum of its proper divisors (1).

216846689 is an equidigital number, since it uses as much as digits as its factorization.

216846689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The square root of 216846689 is about 14725.7152288098. The cubic root of 216846689 is about 600.7829491696.

The spelling of 216846689 in words is "two hundred sixteen million, eight hundred forty-six thousand, six hundred eighty-nine".