9881687 has 2 divisors, whose sum is σ = 9881688. Its totient is φ = 9881686.

The previous prime is 9881671. The next prime is 9881689. The reversal of 9881687 is 7861889.

9881687 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 9881687 - 2⁴ = 9881671 is a prime.

Together with 9881689, 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 (9881689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4940843 + 4940844.

It is an arithmetic number, because the mean of its divisors is an integer number (4940844).

Almost surely, 2^9881687 is an apocalyptic number.

9881687 is a deficient number, since it is larger than the sum of its proper divisors (1).

9881687 is an equidigital number, since it uses as much as digits as its factorization.

9881687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 47.

The square root of 9881687 is about 3143.5150707449. The cubic root of 9881687 is about 214.5904371754.

The spelling of 9881687 in words is "nine million, eight hundred eighty-one thousand, six hundred eighty-seven".