216848861 has 2 divisors, whose sum is σ = 216848862. Its totient is φ = 216848860.

The previous prime is 216848837. The next prime is 216848869. The reversal of 216848861 is 168848612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202179961 + 14668900 = 14219^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 216848861 - 2¹⁸ = 216586717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216848869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108424430 + 108424431.

It is an arithmetic number, because the mean of its divisors is an integer number (108424431).

Almost surely, 2^216848861 is an apocalyptic number.

It is an amenable number.

216848861 is a deficient number, since it is larger than the sum of its proper divisors (1).

216848861 is an equidigital number, since it uses as much as digits as its factorization.

216848861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 44.

The square root of 216848861 is about 14725.7889771652. The cubic root of 216848861 is about 600.7849550356.

The spelling of 216848861 in words is "two hundred sixteen million, eight hundred forty-eight thousand, eight hundred sixty-one".