217083943 has 2 divisors, whose sum is σ = 217083944. Its totient is φ = 217083942.

The previous prime is 217083827. The next prime is 217083947. The reversal of 217083943 is 349380712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217083943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217083947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108541971 + 108541972.

It is an arithmetic number, because the mean of its divisors is an integer number (108541972).

Almost surely, 2^217083943 is an apocalyptic number.

217083943 is a deficient number, since it is larger than the sum of its proper divisors (1).

217083943 is an equidigital number, since it uses as much as digits as its factorization.

217083943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 217083943 is about 14733.7687982403. The cubic root of 217083943 is about 601.0019767322.

It can be divided in two parts, 21708 and 3943, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 217083943 in words is "two hundred seventeen million, eighty-three thousand, nine hundred forty-three".