9981787 has 2 divisors, whose sum is σ = 9981788. Its totient is φ = 9981786.

The previous prime is 9981779. The next prime is 9981799. The reversal of 9981787 is 7871899.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9981787 - 2³ = 9981779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9981787.

It is not a weakly prime, because it can be changed into another prime (9982787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990893 + 4990894.

It is an arithmetic number, because the mean of its divisors is an integer number (4990894).

Almost surely, 2^9981787 is an apocalyptic number.

9981787 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981787 is an equidigital number, since it uses as much as digits as its factorization.

9981787 is an odious number, because the sum of its binary digits is odd.

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

The square root of 9981787 is about 3159.3966196095. The cubic root of 9981787 is about 215.3125937866.

The spelling of 9981787 in words is "nine million, nine hundred eighty-one thousand, seven hundred eighty-seven".