218463313 has 2 divisors, whose sum is σ = 218463314. Its totient is φ = 218463312.

The previous prime is 218463307. The next prime is 218463337. The reversal of 218463313 is 313364812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204861969 + 13601344 = 14313^2 + 3688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218463313 is a prime.

It is not a weakly prime, because it can be changed into another prime (218463383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109231656 + 109231657.

It is an arithmetic number, because the mean of its divisors is an integer number (109231657).

Almost surely, 2^218463313 is an apocalyptic number.

It is an amenable number.

218463313 is a deficient number, since it is larger than the sum of its proper divisors (1).

218463313 is an equidigital number, since it uses as much as digits as its factorization.

218463313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 218463313 is about 14780.5044907134. The cubic root of 218463313 is about 602.2722294632.

The spelling of 218463313 in words is "two hundred eighteen million, four hundred sixty-three thousand, three hundred thirteen".