216245005 has 4 divisors (see below), whose sum is σ = 259494012. Its totient is φ = 172996000.

The previous prime is 216244993. The next prime is 216245009. The reversal of 216245005 is 500542612.

216245005 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 31203396 + 185041609 = 5586^2 + 13603^2 .

It is not a de Polignac number, because 216245005 - 2⁷ = 216244877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216245009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21624496 + ... + 21624505.

It is an arithmetic number, because the mean of its divisors is an integer number (64873503).

Almost surely, 2^216245005 is an apocalyptic number.

It is an amenable number.

216245005 is a deficient number, since it is larger than the sum of its proper divisors (43249007).

216245005 is an equidigital number, since it uses as much as digits as its factorization.

216245005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43249006.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 216245005 is about 14705.2713337769. The cubic root of 216245005 is about 600.2267707624.

Adding to 216245005 its reverse (500542612), we get a palindrome (716787617).

The spelling of 216245005 in words is "two hundred sixteen million, two hundred forty-five thousand, five".