216678713 has 2 divisors, whose sum is σ = 216678714. Its totient is φ = 216678712.

The previous prime is 216678703. The next prime is 216678757. The reversal of 216678713 is 317876612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178275904 + 38402809 = 13352^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 216678713 - 2⁸ = 216678457 is a prime.

It is not a weakly prime, because it can be changed into another prime (216678703) 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, 108339356 + 108339357.

It is an arithmetic number, because the mean of its divisors is an integer number (108339357).

Almost surely, 2^216678713 is an apocalyptic number.

It is an amenable number.

216678713 is a deficient number, since it is larger than the sum of its proper divisors (1).

216678713 is an equidigital number, since it uses as much as digits as its factorization.

216678713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 216678713 is about 14720.0106317896. The cubic root of 216678713 is about 600.6277808858.

The spelling of 216678713 in words is "two hundred sixteen million, six hundred seventy-eight thousand, seven hundred thirteen".