216441265 has 4 divisors (see below), whose sum is σ = 259729524. Its totient is φ = 173153008.

The previous prime is 216441259. The next prime is 216441311. The reversal of 216441265 is 562144612.

It is a happy number.

216441265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89946256 + 126495009 = 9484^2 + 11247^2 .

It is a cyclic number.

It is not a de Polignac number, because 216441265 - 2⁵ = 216441233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21644122 + ... + 21644131.

It is an arithmetic number, because the mean of its divisors is an integer number (64932381).

Almost surely, 2^216441265 is an apocalyptic number.

It is an amenable number.

216441265 is a deficient number, since it is larger than the sum of its proper divisors (43288259).

216441265 is an equidigital number, since it uses as much as digits as its factorization.

216441265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43288258.

The product of its digits is 11520, while the sum is 31.

The square root of 216441265 is about 14711.9429376272. The cubic root of 216441265 is about 600.4083007915.

Adding to 216441265 its reverse (562144612), we get a palindrome (778585877).

The spelling of 216441265 in words is "two hundred sixteen million, four hundred forty-one thousand, two hundred sixty-five".