9982781 has 2 divisors, whose sum is σ = 9982782. Its totient is φ = 9982780.

The previous prime is 9982769. The next prime is 9982783. The reversal of 9982781 is 1872899.

9982781 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 217156 = 3125^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 9982781 - 2²² = 5788477 is a prime.

It is a super-2 number, since 2×9982781² = 199311832987922, which contains 22 as substring.

Together with 9982783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9982783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4991390 + 4991391.

It is an arithmetic number, because the mean of its divisors is an integer number (4991391).

Almost surely, 2^9982781 is an apocalyptic number.

It is an amenable number.

9982781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9982781 is an equidigital number, since it uses as much as digits as its factorization.

9982781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 44.

The square root of 9982781 is about 3159.5539242115. The cubic root of 9982781 is about 215.3197405902.

The spelling of 9982781 in words is "nine million, nine hundred eighty-two thousand, seven hundred eighty-one".