216703813 has 2 divisors, whose sum is σ = 216703814. Its totient is φ = 216703812.

The previous prime is 216703807. The next prime is 216703849. The reversal of 216703813 is 318307612.

216703813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204432804 + 12271009 = 14298^2 + 3503^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216703813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216703013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108351906 + 108351907.

It is an arithmetic number, because the mean of its divisors is an integer number (108351907).

Almost surely, 2^216703813 is an apocalyptic number.

It is an amenable number.

216703813 is a deficient number, since it is larger than the sum of its proper divisors (1).

216703813 is an equidigital number, since it uses as much as digits as its factorization.

216703813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 216703813 is about 14720.8631880063. The cubic root of 216703813 is about 600.6509721737.

The spelling of 216703813 in words is "two hundred sixteen million, seven hundred three thousand, eight hundred thirteen".