216719 has 2 divisors, whose sum is σ = 216720. Its totient is φ = 216718.

The previous prime is 216703. The next prime is 216731. The reversal of 216719 is 917612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216719 - 2⁴ = 216703 is a prime.

It is a super-2 number, since 2×216719² = 93934249922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108359 + 108360.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2²¹⁶⁷¹⁹ is an apocalyptic number.

216719 is a deficient number, since it is larger than the sum of its proper divisors (1).

216719 is an equidigital number, since it uses as much as digits as its factorization.

216719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 26.

The square root of 216719 is about 465.5308797491. The cubic root of 216719 is about 60.0665003419.

The spelling of 216719 in words is "two hundred sixteen thousand, seven hundred nineteen".