16718213 has 2 divisors, whose sum is σ = 16718214. Its totient is φ = 16718212.

The previous prime is 16718197. The next prime is 16718231. The reversal of 16718213 is 31281761.

Together with next prime (16718231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11847364 + 4870849 = 3442^2 + 2207^2 .

It is a cyclic number.

It is not a de Polignac number, because 16718213 - 2⁴ = 16718197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16718813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8359106 + 8359107.

It is an arithmetic number, because the mean of its divisors is an integer number (8359107).

Almost surely, 2^16718213 is an apocalyptic number.

It is an amenable number.

16718213 is a deficient number, since it is larger than the sum of its proper divisors (1).

16718213 is an equidigital number, since it uses as much as digits as its factorization.

16718213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 16718213 is about 4088.7911416457. The cubic root of 16718213 is about 255.6995427259.

Adding to 16718213 its reverse (31281761), we get a palindrome (47999974).

The spelling of 16718213 in words is "sixteen million, seven hundred eighteen thousand, two hundred thirteen".