216240361 has 2 divisors, whose sum is σ = 216240362. Its totient is φ = 216240360.

The previous prime is 216240359. The next prime is 216240397. The reversal of 216240361 is 163042612.

216240361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154853136 + 61387225 = 12444^2 + 7835^2 .

It is a cyclic number.

It is not a de Polignac number, because 216240361 - 2¹ = 216240359 is a prime.

Together with 216240359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (216240161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108120180 + 108120181.

It is an arithmetic number, because the mean of its divisors is an integer number (108120181).

Almost surely, 2^216240361 is an apocalyptic number.

It is an amenable number.

216240361 is a deficient number, since it is larger than the sum of its proper divisors (1).

216240361 is an equidigital number, since it uses as much as digits as its factorization.

216240361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 216240361 is about 14705.1134303684. The cubic root of 216240361 is about 600.2224739802. Note that the first 3 decimals are identical.

Adding to 216240361 its reverse (163042612), we get a palindrome (379282973).

The spelling of 216240361 in words is "two hundred sixteen million, two hundred forty thousand, three hundred sixty-one".