9997321 has 2 divisors, whose sum is σ = 9997322.
Its totient is φ = 9997320.
The previous prime is 9997319. The next prime is 9997327. The reversal of 9997321 is 1237999.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 9455625 + 541696 = 3075^2 + 736^2
It is a cyclic number.
It is not a de Polignac number, because 9997321 - 21 = 9997319 is a prime.
Together with 9997319, it forms a pair of twin primes.
It is an Ulam number.
It is a nialpdrome in base 10.
It is not a weakly prime, because it can be changed into another prime (9997327) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998660 + 4998661.
It is an arithmetic number, because the mean of its divisors is an integer number (4998661).
Almost surely, 29997321 is an apocalyptic number.
It is an amenable number.
9997321 is a deficient number, since it is larger than the sum of its proper divisors (1).
9997321 is an equidigital number, since it uses as much as digits as its factorization.
9997321 is an evil number, because the sum of its binary digits is even.
The product of its digits is 30618, while the sum is 40.
The square root of 9997321 is about 3161.8540447023.
The cubic root of 9997321 is about 215.4242281831.
The spelling of 9997321 in words is "nine million, nine hundred ninety-seven thousand, three hundred twenty-one".