97417020721 has 2 divisors, whose sum is σ = 97417020722. Its totient is φ = 97417020720.

The previous prime is 97417020653. The next prime is 97417020733. The reversal of 97417020721 is 12702071479.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86812140321 + 10604880400 = 294639^2 + 102980^2 .

It is an emirp because it is prime and its reverse (12702071479) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97417020721 - 2⁷ = 97417020593 is a prime.

It is not a weakly prime, because it can be changed into another prime (97417020791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48708510360 + 48708510361.

It is an arithmetic number, because the mean of its divisors is an integer number (48708510361).

Almost surely, 2^97417020721 is an apocalyptic number.

It is an amenable number.

97417020721 is a deficient number, since it is larger than the sum of its proper divisors (1).

97417020721 is an equidigital number, since it uses as much as digits as its factorization.

97417020721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 97417020721 in words is "ninety-seven billion, four hundred seventeen million, twenty thousand, seven hundred twenty-one".