9991297 has 2 divisors, whose sum is σ = 9991298. Its totient is φ = 9991296.

The previous prime is 9991277. The next prime is 9991301. The reversal of 9991297 is 7921999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7529536 + 2461761 = 2744^2 + 1569^2 .

It is an emirp because it is prime and its reverse (7921999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9991297 is a prime.

It is not a weakly prime, because it can be changed into another prime (9991277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995648 + 4995649.

It is an arithmetic number, because the mean of its divisors is an integer number (4995649).

Almost surely, 2^9991297 is an apocalyptic number.

It is an amenable number.

9991297 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991297 is an equidigital number, since it uses as much as digits as its factorization.

9991297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 46.

The square root of 9991297 is about 3160.9012955168. The cubic root of 9991297 is about 215.3809507128.

The spelling of 9991297 in words is "nine million, nine hundred ninety-one thousand, two hundred ninety-seven".