9867006781 has 2 divisors, whose sum is σ = 9867006782. Its totient is φ = 9867006780.

The previous prime is 9867006769. The next prime is 9867006803. The reversal of 9867006781 is 1876007689.

9867006781 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., 9828937881 + 38068900 = 99141^2 + 6170^2 .

It is a cyclic number.

It is not a de Polignac number, because 9867006781 - 2¹⁷ = 9866875709 is a prime.

It is a super-2 number, since 2×9867006781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9867006731) 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, 4933503390 + 4933503391.

It is an arithmetic number, because the mean of its divisors is an integer number (4933503391).

Almost surely, 2^9867006781 is an apocalyptic number.

It is an amenable number.

9867006781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9867006781 is an equidigital number, since it uses as much as digits as its factorization.

9867006781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 9867006781 is about 99332.8081803792. The cubic root of 9867006781 is about 2144.8411943511.

The spelling of 9867006781 in words is "nine billion, eight hundred sixty-seven million, six thousand, seven hundred eighty-one".