9807138989 has 2 divisors, whose sum is σ = 9807138990. Its totient is φ = 9807138988.

The previous prime is 9807138953. The next prime is 9807139019. The reversal of 9807138989 is 9898317089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7402021225 + 2405117764 = 86035^2 + 49042^2 .

It is an emirp because it is prime and its reverse (9898317089) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9807138989 - 2²⁴ = 9790361773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9807138589) 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, 4903569494 + 4903569495.

It is an arithmetic number, because the mean of its divisors is an integer number (4903569495).

Almost surely, 2^9807138989 is an apocalyptic number.

It is an amenable number.

9807138989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9807138989 is an equidigital number, since it uses as much as digits as its factorization.

9807138989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The square root of 9807138989 is about 99031.0001413699. Note that the first 3 decimals coincide. The cubic root of 9807138989 is about 2140.4944696180.

The spelling of 9807138989 in words is "nine billion, eight hundred seven million, one hundred thirty-eight thousand, nine hundred eighty-nine".