97890797 has 2 divisors, whose sum is σ = 97890798. Its totient is φ = 97890796.

The previous prime is 97890763. The next prime is 97890809. The reversal of 97890797 is 79709879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85174441 + 12716356 = 9229^2 + 3566^2 .

It is an emirp because it is prime and its reverse (79709879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97890797 - 2¹⁰ = 97889773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97890757) 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, 48945398 + 48945399.

It is an arithmetic number, because the mean of its divisors is an integer number (48945399).

Almost surely, 2^97890797 is an apocalyptic number.

It is an amenable number.

97890797 is a deficient number, since it is larger than the sum of its proper divisors (1).

97890797 is an equidigital number, since it uses as much as digits as its factorization.

97890797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 56.

The square root of 97890797 is about 9893.9778148124. The cubic root of 97890797 is about 460.8723160767.

The spelling of 97890797 in words is "ninety-seven million, eight hundred ninety thousand, seven hundred ninety-seven".