216944449 has 2 divisors, whose sum is σ = 216944450. Its totient is φ = 216944448.

The previous prime is 216944437. The next prime is 216944473. The reversal of 216944449 is 944449612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203490225 + 13454224 = 14265^2 + 3668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216944449 is a prime.

It is not a weakly prime, because it can be changed into another prime (216944419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108472224 + 108472225.

It is an arithmetic number, because the mean of its divisors is an integer number (108472225).

Almost surely, 2^216944449 is an apocalyptic number.

It is an amenable number.

216944449 is a deficient number, since it is larger than the sum of its proper divisors (1).

216944449 is an equidigital number, since it uses as much as digits as its factorization.

216944449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 216944449 is about 14729.0342181692. The cubic root of 216944449 is about 600.8732183478.

The spelling of 216944449 in words is "two hundred sixteen million, nine hundred forty-four thousand, four hundred forty-nine".