216443449 has 2 divisors, whose sum is σ = 216443450. Its totient is φ = 216443448.

The previous prime is 216443431. The next prime is 216443471. The reversal of 216443449 is 944344612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183873600 + 32569849 = 13560^2 + 5707^2 .

It is a cyclic number.

It is not a de Polignac number, because 216443449 - 2⁵ = 216443417 is a prime.

It is not a weakly prime, because it can be changed into another prime (216453449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108221724 + 108221725.

It is an arithmetic number, because the mean of its divisors is an integer number (108221725).

Almost surely, 2^216443449 is an apocalyptic number.

It is an amenable number.

216443449 is a deficient number, since it is larger than the sum of its proper divisors (1).

216443449 is an equidigital number, since it uses as much as digits as its factorization.

216443449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 37.

The square root of 216443449 is about 14712.0171628502. The cubic root of 216443449 is about 600.4103202574.

The spelling of 216443449 in words is "two hundred sixteen million, four hundred forty-three thousand, four hundred forty-nine".