9917321 has 2 divisors, whose sum is σ = 9917322. Its totient is φ = 9917320.

The previous prime is 9917317. The next prime is 9917353. The reversal of 9917321 is 1237199.

It is a happy number.

9917321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (9917353) can be obtained adding 9917321 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9369721 + 547600 = 3061^2 + 740^2 .

It is an emirp because it is prime and its reverse (1237199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9917321 - 2² = 9917317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9917371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4958660 + 4958661.

It is an arithmetic number, because the mean of its divisors is an integer number (4958661).

Almost surely, 2^9917321 is an apocalyptic number.

It is an amenable number.

9917321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9917321 is an equidigital number, since it uses as much as digits as its factorization.

9917321 is an evil number, because the sum of its binary digits is even.

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

The square root of 9917321 is about 3149.1778292119. The cubic root of 9917321 is about 214.8480700570.

The spelling of 9917321 in words is "nine million, nine hundred seventeen thousand, three hundred twenty-one".