989308709 has 2 divisors, whose sum is σ = 989308710. Its totient is φ = 989308708.

The previous prime is 989308651. The next prime is 989308763. The reversal of 989308709 is 907803989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 761208100 + 228100609 = 27590^2 + 15103^2 .

It is an emirp because it is prime and its reverse (907803989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989308709 - 2¹⁶ = 989243173 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (989308409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494654354 + 494654355.

It is an arithmetic number, because the mean of its divisors is an integer number (494654355).

Almost surely, 2^989308709 is an apocalyptic number.

It is an amenable number.

989308709 is a deficient number, since it is larger than the sum of its proper divisors (1).

989308709 is an equidigital number, since it uses as much as digits as its factorization.

989308709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 989308709 is about 31453.2781916289. The cubic root of 989308709 is about 996.4234599445.

The spelling of 989308709 in words is "nine hundred eighty-nine million, three hundred eight thousand, seven hundred nine".