216841 has 2 divisors, whose sum is σ = 216842. Its totient is φ = 216840.

The previous prime is 216829. The next prime is 216851. The reversal of 216841 is 148612.

216841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156816 + 60025 = 396^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 216841 - 2⁹ = 216329 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108420 + 108421.

It is an arithmetic number, because the mean of its divisors is an integer number (108421).

2²¹⁶⁸⁴¹ is an apocalyptic number.

It is an amenable number.

216841 is a deficient number, since it is larger than the sum of its proper divisors (1).

216841 is an equidigital number, since it uses as much as digits as its factorization.

216841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 22.

The square root of 216841 is about 465.6618945115. The cubic root of 216841 is about 60.0777695252.

It can be divided in two parts, 2168 and 41, that multiplied together give a palindrome (88888).

The spelling of 216841 in words is "two hundred sixteen thousand, eight hundred forty-one".