9791321 has 2 divisors, whose sum is σ = 9791322. Its totient is φ = 9791320.

The previous prime is 9791317. The next prime is 9791323. The reversal of 9791321 is 1231979.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9388096 + 403225 = 3064^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 9791321 - 2² = 9791317 is a prime.

Together with 9791323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9791323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4895660 + 4895661.

It is an arithmetic number, because the mean of its divisors is an integer number (4895661).

Almost surely, 2^9791321 is an apocalyptic number.

It is an amenable number.

9791321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9791321 is an equidigital number, since it uses as much as digits as its factorization.

9791321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 32.

The square root of 9791321 is about 3129.1086590274. The cubic root of 9791321 is about 213.9343045206.

The spelling of 9791321 in words is "nine million, seven hundred ninety-one thousand, three hundred twenty-one".