9987683989 has 2 divisors, whose sum is σ = 9987683990. Its totient is φ = 9987683988.

The previous prime is 9987683977. The next prime is 9987684019. The reversal of 9987683989 is 9893867899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6958062225 + 3029621764 = 83415^2 + 55042^2 .

It is a cyclic number.

It is not a de Polignac number, because 9987683989 - 2¹⁷ = 9987552917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9987683929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993841994 + 4993841995.

It is an arithmetic number, because the mean of its divisors is an integer number (4993841995).

Almost surely, 2^9987683989 is an apocalyptic number.

It is an amenable number.

9987683989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987683989 is an equidigital number, since it uses as much as digits as its factorization.

9987683989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423263232, while the sum is 76.

The square root of 9987683989 is about 99938.4009727992. The cubic root of 9987683989 is about 2153.5498586346.

The spelling of 9987683989 in words is "nine billion, nine hundred eighty-seven million, six hundred eighty-three thousand, nine hundred eighty-nine".