989695709 has 2 divisors, whose sum is σ = 989695710. Its totient is φ = 989695708.

The previous prime is 989695691. The next prime is 989695741. The reversal of 989695709 is 907596989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746491684 + 243204025 = 27322^2 + 15595^2 .

It is a cyclic number.

It is not a de Polignac number, because 989695709 - 2⁸ = 989695453 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 (989695799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494847854 + 494847855.

It is an arithmetic number, because the mean of its divisors is an integer number (494847855).

Almost surely, 2^989695709 is an apocalyptic number.

It is an amenable number.

989695709 is a deficient number, since it is larger than the sum of its proper divisors (1).

989695709 is an equidigital number, since it uses as much as digits as its factorization.

989695709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11022480, while the sum is 62.

The square root of 989695709 is about 31459.4295720695. The cubic root of 989695709 is about 996.5533707278.

The spelling of 989695709 in words is "nine hundred eighty-nine million, six hundred ninety-five thousand, seven hundred nine".