216775849 has 2 divisors, whose sum is σ = 216775850. Its totient is φ = 216775848.

The previous prime is 216775843. The next prime is 216775873. The reversal of 216775849 is 948577612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215150224 + 1625625 = 14668^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 216775849 - 2⁵ = 216775817 is a prime.

It is not a weakly prime, because it can be changed into another prime (216775843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108387924 + 108387925.

It is an arithmetic number, because the mean of its divisors is an integer number (108387925).

Almost surely, 2^216775849 is an apocalyptic number.

It is an amenable number.

216775849 is a deficient number, since it is larger than the sum of its proper divisors (1).

216775849 is an equidigital number, since it uses as much as digits as its factorization.

216775849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 216775849 is about 14723.3097162289. The cubic root of 216775849 is about 600.7175203027.

The spelling of 216775849 in words is "two hundred sixteen million, seven hundred seventy-five thousand, eight hundred forty-nine".