9887971 has 2 divisors, whose sum is σ = 9887972. Its totient is φ = 9887970.

The previous prime is 9887939. The next prime is 9887993. The reversal of 9887971 is 1797889.

9887971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9887971 - 2⁵ = 9887939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9887921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4943985 + 4943986.

It is an arithmetic number, because the mean of its divisors is an integer number (4943986).

Almost surely, 2^9887971 is an apocalyptic number.

9887971 is a deficient number, since it is larger than the sum of its proper divisors (1).

9887971 is an equidigital number, since it uses as much as digits as its factorization.

9887971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 49.

The square root of 9887971 is about 3144.5144299240. The cubic root of 9887971 is about 214.6359152590.

The spelling of 9887971 in words is "nine million, eight hundred eighty-seven thousand, nine hundred seventy-one".