218316013 has 2 divisors, whose sum is σ = 218316014. Its totient is φ = 218316012.

The previous prime is 218316001. The next prime is 218316047. The reversal of 218316013 is 310613812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184362084 + 33953929 = 13578^2 + 5827^2 .

It is a cyclic number.

It is not a de Polignac number, because 218316013 - 2⁹ = 218315501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218316313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109158006 + 109158007.

It is an arithmetic number, because the mean of its divisors is an integer number (109158007).

Almost surely, 2^218316013 is an apocalyptic number.

It is an amenable number.

218316013 is a deficient number, since it is larger than the sum of its proper divisors (1).

218316013 is an equidigital number, since it uses as much as digits as its factorization.

218316013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 218316013 is about 14775.5207353244. The cubic root of 218316013 is about 602.1368373243.

Adding to 218316013 its reverse (310613812), we get a palindrome (528929825).

The spelling of 218316013 in words is "two hundred eighteen million, three hundred sixteen thousand, thirteen".