16516217 has 2 divisors, whose sum is σ = 16516218. Its totient is φ = 16516216.

The previous prime is 16516207. The next prime is 16516219. The reversal of 16516217 is 71261561.

16516217 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., 16516096 + 121 = 4064^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 16516217 - 2¹⁰ = 16515193 is a prime.

Together with 16516219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16516217.

It is not a weakly prime, because it can be changed into another prime (16516219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8258108 + 8258109.

It is an arithmetic number, because the mean of its divisors is an integer number (8258109).

Almost surely, 2^16516217 is an apocalyptic number.

It is an amenable number.

16516217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16516217 is an equidigital number, since it uses as much as digits as its factorization.

16516217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 16516217 is about 4064.0148867838. The cubic root of 16516217 is about 254.6655464058.

Adding to 16516217 its reverse (71261561), we get a palindrome (87777778).

The spelling of 16516217 in words is "sixteen million, five hundred sixteen thousand, two hundred seventeen".