9851987 has 2 divisors, whose sum is σ = 9851988. Its totient is φ = 9851986.

The previous prime is 9851977. The next prime is 9852019. The reversal of 9851987 is 7891589.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (7891589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9851987 - 2⁶ = 9851923 is a prime.

It is not a weakly prime, because it can be changed into another prime (9851977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4925993 + 4925994.

It is an arithmetic number, because the mean of its divisors is an integer number (4925994).

Almost surely, 2^9851987 is an apocalyptic number.

9851987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9851987 is an equidigital number, since it uses as much as digits as its factorization.

9851987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 47.

The square root of 9851987 is about 3138.7875047540. The cubic root of 9851987 is about 214.3752333067.

The spelling of 9851987 in words is "nine million, eight hundred fifty-one thousand, nine hundred eighty-seven".