9716821 has 2 divisors, whose sum is σ = 9716822. Its totient is φ = 9716820.

The previous prime is 9716807. The next prime is 9716851. The reversal of 9716821 is 1286179.

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., 6426225 + 3290596 = 2535^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 9716821 - 2⁵ = 9716789 is a prime.

It is a super-2 number, since 2×9716821² = 188833220692082, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9716801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4858410 + 4858411.

It is an arithmetic number, because the mean of its divisors is an integer number (4858411).

Almost surely, 2^9716821 is an apocalyptic number.

It is an amenable number.

9716821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9716821 is an equidigital number, since it uses as much as digits as its factorization.

9716821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 9716821 is about 3117.1815795683. The cubic root of 9716821 is about 213.3903295518.

The spelling of 9716821 in words is "nine million, seven hundred sixteen thousand, eight hundred twenty-one".