216986711 has 2 divisors, whose sum is σ = 216986712. Its totient is φ = 216986710.

The previous prime is 216986687. The next prime is 216986743. The reversal of 216986711 is 117689612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216986711 - 2¹⁰ = 216985687 is a 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 (216986771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108493355 + 108493356.

It is an arithmetic number, because the mean of its divisors is an integer number (108493356).

Almost surely, 2^216986711 is an apocalyptic number.

216986711 is a deficient number, since it is larger than the sum of its proper divisors (1).

216986711 is an equidigital number, since it uses as much as digits as its factorization.

216986711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 216986711 is about 14730.4687976995. The cubic root of 216986711 is about 600.9122336430.

The spelling of 216986711 in words is "two hundred sixteen million, nine hundred eighty-six thousand, seven hundred eleven".