97798913 has 2 divisors, whose sum is σ = 97798914. Its totient is φ = 97798912.

The previous prime is 97798891. The next prime is 97798937. The reversal of 97798913 is 31989779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64529089 + 33269824 = 8033^2 + 5768^2 .

It is an emirp because it is prime and its reverse (31989779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97798913 - 2²⁴ = 81021697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (97798973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48899456 + 48899457.

It is an arithmetic number, because the mean of its divisors is an integer number (48899457).

Almost surely, 2^97798913 is an apocalyptic number.

It is an amenable number.

97798913 is a deficient number, since it is larger than the sum of its proper divisors (1).

97798913 is an equidigital number, since it uses as much as digits as its factorization.

97798913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 53.

The square root of 97798913 is about 9889.3332940093. Note that the first 3 decimals coincide. The cubic root of 97798913 is about 460.7280735481.

The spelling of 97798913 in words is "ninety-seven million, seven hundred ninety-eight thousand, nine hundred thirteen".