9855971387 has 2 divisors, whose sum is σ = 9855971388. Its totient is φ = 9855971386.

The previous prime is 9855971381. The next prime is 9855971443. The reversal of 9855971387 is 7831795589.

9855971387 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 9855971387 - 2³² = 5561004091 is a prime.

It is not a weakly prime, because it can be changed into another prime (9855971381) 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, 4927985693 + 4927985694.

It is an arithmetic number, because the mean of its divisors is an integer number (4927985694).

Almost surely, 2^9855971387 is an apocalyptic number.

9855971387 is a deficient number, since it is larger than the sum of its proper divisors (1).

9855971387 is an equidigital number, since it uses as much as digits as its factorization.

9855971387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19051200, while the sum is 62.

The square root of 9855971387 is about 99277.2450614943. The cubic root of 9855971387 is about 2144.0412895900.

The spelling of 9855971387 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, three hundred eighty-seven".