97997321 has 2 divisors, whose sum is σ = 97997322. Its totient is φ = 97997320.

The previous prime is 97997279. The next prime is 97997323. The reversal of 97997321 is 12379979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96924025 + 1073296 = 9845^2 + 1036^2 .

It is an emirp because it is prime and its reverse (12379979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97997321 is a prime.

Together with 97997323, 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 (97997323) 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, 48998660 + 48998661.

It is an arithmetic number, because the mean of its divisors is an integer number (48998661).

Almost surely, 2^97997321 is an apocalyptic number.

It is an amenable number.

97997321 is a deficient number, since it is larger than the sum of its proper divisors (1).

97997321 is an equidigital number, since it uses as much as digits as its factorization.

97997321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 214326, while the sum is 47.

The square root of 97997321 is about 9899.3596257536. The cubic root of 97997321 is about 461.0394280251.

It can be divided in two parts, 979 and 97321, that multiplied together give a palindrome (95277259).

The spelling of 97997321 in words is "ninety-seven million, nine hundred ninety-seven thousand, three hundred twenty-one".