216790913 has 2 divisors, whose sum is σ = 216790914. Its totient is φ = 216790912.

The previous prime is 216790909. The next prime is 216790927. The reversal of 216790913 is 319097612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143808064 + 72982849 = 11992^2 + 8543^2 .

It is a cyclic number.

It is not a de Polignac number, because 216790913 - 2² = 216790909 is a prime.

It is not a weakly prime, because it can be changed into another prime (216790963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108395456 + 108395457.

It is an arithmetic number, because the mean of its divisors is an integer number (108395457).

Almost surely, 2^216790913 is an apocalyptic number.

It is an amenable number.

216790913 is a deficient number, since it is larger than the sum of its proper divisors (1).

216790913 is an equidigital number, since it uses as much as digits as its factorization.

216790913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 216790913 is about 14723.8212771006. The cubic root of 216790913 is about 600.7314348280.

The spelling of 216790913 in words is "two hundred sixteen million, seven hundred ninety thousand, nine hundred thirteen".