9997805897 has 2 divisors, whose sum is σ = 9997805898. Its totient is φ = 9997805896.

The previous prime is 9997805863. The next prime is 9997805903. The reversal of 9997805897 is 7985087999.

9997805897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9997800121 + 5776 = 99989^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997805897 - 2⁸ = 9997805641 is a prime.

It is a super-2 number, since 2×9997805897² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9997805897.

It is not a weakly prime, because it can be changed into another prime (9997805197) 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, 4998902948 + 4998902949.

It is an arithmetic number, because the mean of its divisors is an integer number (4998902949).

Almost surely, 2^9997805897 is an apocalyptic number.

It is an amenable number.

9997805897 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997805897 is an equidigital number, since it uses as much as digits as its factorization.

9997805897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102876480, while the sum is 71.

The square root of 9997805897 is about 99989.0288831730. The cubic root of 9997805897 is about 2154.2771101192.

The spelling of 9997805897 in words is "nine billion, nine hundred ninety-seven million, eight hundred five thousand, eight hundred ninety-seven".