97221217 has 2 divisors, whose sum is σ = 97221218. Its totient is φ = 97221216.

The previous prime is 97221191. The next prime is 97221227. The reversal of 97221217 is 71212279.

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., 83978896 + 13242321 = 9164^2 + 3639^2 .

It is an emirp because it is prime and its reverse (71212279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97221217 - 2¹¹ = 97219169 is a prime.

It is a super-2 number, since 2×97221217² = 18903930069922178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97221227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48610608 + 48610609.

It is an arithmetic number, because the mean of its divisors is an integer number (48610609).

Almost surely, 2^97221217 is an apocalyptic number.

It is an amenable number.

97221217 is a deficient number, since it is larger than the sum of its proper divisors (1).

97221217 is an equidigital number, since it uses as much as digits as its factorization.

97221217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 97221217 is about 9860.0819976306. The cubic root of 97221217 is about 459.8191112970.

The spelling of 97221217 in words is "ninety-seven million, two hundred twenty-one thousand, two hundred seventeen".