216787 has 2 divisors, whose sum is σ = 216788. Its totient is φ = 216786.

The previous prime is 216781. The next prime is 216791. The reversal of 216787 is 787612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216787 - 2³ = 216779 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (216781) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108393 + 108394.

It is an arithmetic number, because the mean of its divisors is an integer number (108394).

2²¹⁶⁷⁸⁷ is an apocalyptic number.

216787 is a deficient number, since it is larger than the sum of its proper divisors (1).

216787 is an equidigital number, since it uses as much as digits as its factorization.

216787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 31.

The square root of 216787 is about 465.6039089183. The cubic root of 216787 is about 60.0727820476.

The spelling of 216787 in words is "two hundred sixteen thousand, seven hundred eighty-seven".