9881647 has 2 divisors, whose sum is σ = 9881648. Its totient is φ = 9881646.

The previous prime is 9881639. The next prime is 9881671. The reversal of 9881647 is 7461889.

9881647 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 is a cyclic number.

It is not a de Polignac number, because 9881647 - 2³ = 9881639 is a prime.

9881647 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9881687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4940823 + 4940824.

It is an arithmetic number, because the mean of its divisors is an integer number (4940824).

Almost surely, 2^9881647 is an apocalyptic number.

9881647 is a deficient number, since it is larger than the sum of its proper divisors (1).

9881647 is an equidigital number, since it uses as much as digits as its factorization.

9881647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The square root of 9881647 is about 3143.5087084339. The cubic root of 9881647 is about 214.5901476287.

Subtracting from 9881647 its product of digits (96768), we obtain a palindrome (9784879).

The spelling of 9881647 in words is "nine million, eight hundred eighty-one thousand, six hundred forty-seven".