9997997 has 2 divisors, whose sum is σ = 9997998. Its totient is φ = 9997996.

The previous prime is 9997991. The next prime is 9998017. The reversal of 9997997 is 7997999.

9997997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9916201 + 81796 = 3149^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997997 - 2¹² = 9993901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998998 + 4998999.

It is an arithmetic number, because the mean of its divisors is an integer number (4998999).

Almost surely, 2^9997997 is an apocalyptic number.

It is an amenable number.

9997997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997997 is an equidigital number, since it uses as much as digits as its factorization.

9997997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2893401, while the sum is 59.

The square root of 9997997 is about 3161.9609422003. The cubic root of 9997997 is about 215.4290836004.

The spelling of 9997997 in words is "nine million, nine hundred ninety-seven thousand, nine hundred ninety-seven".