9699889909 has 2 divisors, whose sum is σ = 9699889910. Its totient is φ = 9699889908.

The previous prime is 9699889907. The next prime is 9699889931. The reversal of 9699889909 is 9099889969.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9482474884 + 217415025 = 97378^2 + 14745^2 .

It is a cyclic number.

It is not a de Polignac number, because 9699889909 - 2¹ = 9699889907 is a prime.

Together with 9699889907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9699889907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4849944954 + 4849944955.

It is an arithmetic number, because the mean of its divisors is an integer number (4849944955).

Almost surely, 2^9699889909 is an apocalyptic number.

It is an amenable number.

9699889909 is a deficient number, since it is larger than the sum of its proper divisors (1).

9699889909 is an equidigital number, since it uses as much as digits as its factorization.

9699889909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204073344, while the sum is 76.

The square root of 9699889909 is about 98488.0191140019. The cubic root of 9699889909 is about 2132.6631671623.

The spelling of 9699889909 in words is "nine billion, six hundred ninety-nine million, eight hundred eighty-nine thousand, nine hundred nine".