216704843 has 2 divisors, whose sum is σ = 216704844. Its totient is φ = 216704842.

The previous prime is 216704777. The next prime is 216704857. The reversal of 216704843 is 348407612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216704843 is a prime.

It is not a weakly prime, because it can be changed into another prime (216724843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108352421 + 108352422.

It is an arithmetic number, because the mean of its divisors is an integer number (108352422).

Almost surely, 2^216704843 is an apocalyptic number.

216704843 is a deficient number, since it is larger than the sum of its proper divisors (1).

216704843 is an equidigital number, since it uses as much as digits as its factorization.

216704843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 216704843 is about 14720.8981723263. The cubic root of 216704843 is about 600.6519238098.

The spelling of 216704843 in words is "two hundred sixteen million, seven hundred four thousand, eight hundred forty-three".