9916981 has 2 divisors, whose sum is σ = 9916982. Its totient is φ = 9916980.

The previous prime is 9916969. The next prime is 9917009. The reversal of 9916981 is 1896199.

9916981 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., 8213956 + 1703025 = 2866^2 + 1305^2 .

It is an emirp because it is prime and its reverse (1896199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9916981 is a prime.

It is a super-2 number, since 2×9916981² = 196693024308722, which contains 22 as substring.

9916981 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9916681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958490 + 4958491.

It is an arithmetic number, because the mean of its divisors is an integer number (4958491).

Almost surely, 2^9916981 is an apocalyptic number.

It is an amenable number.

9916981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9916981 is an equidigital number, since it uses as much as digits as its factorization.

9916981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 43.

The square root of 9916981 is about 3149.1238464055. The cubic root of 9916981 is about 214.8456147845.

The spelling of 9916981 in words is "nine million, nine hundred sixteen thousand, nine hundred eighty-one".