989776009 has 2 divisors, whose sum is σ = 989776010. Its totient is φ = 989776008.

The previous prime is 989775979. The next prime is 989776013. The reversal of 989776009 is 900677989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 775065600 + 214710409 = 27840^2 + 14653^2 .

It is an emirp because it is prime and its reverse (900677989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989776009 - 2⁷ = 989775881 is a prime.

It is not a weakly prime, because it can be changed into another prime (989776019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494888004 + 494888005.

It is an arithmetic number, because the mean of its divisors is an integer number (494888005).

Almost surely, 2^989776009 is an apocalyptic number.

It is an amenable number.

989776009 is a deficient number, since it is larger than the sum of its proper divisors (1).

989776009 is an equidigital number, since it uses as much as digits as its factorization.

989776009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 989776009 is about 31460.7057931001. The cubic root of 989776009 is about 996.5803221334.

The spelling of 989776009 in words is "nine hundred eighty-nine million, seven hundred seventy-six thousand, nine".