216443959 has 2 divisors, whose sum is σ = 216443960. Its totient is φ = 216443958.

The previous prime is 216443947. The next prime is 216443999. The reversal of 216443959 is 959344612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216443959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216443939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108221979 + 108221980.

It is an arithmetic number, because the mean of its divisors is an integer number (108221980).

Almost surely, 2^216443959 is an apocalyptic number.

216443959 is a deficient number, since it is larger than the sum of its proper divisors (1).

216443959 is an equidigital number, since it uses as much as digits as its factorization.

216443959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 216443959 is about 14712.0344956094. The cubic root of 216443959 is about 600.4107918341.

The spelling of 216443959 in words is "two hundred sixteen million, four hundred forty-three thousand, nine hundred fifty-nine".