97964809 has 2 divisors, whose sum is σ = 97964810. Its totient is φ = 97964808.

The previous prime is 97964773. The next prime is 97964831. The reversal of 97964809 is 90846979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63154809 + 34810000 = 7947^2 + 5900^2 .

It is an emirp because it is prime and its reverse (90846979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97964809 is a prime.

It is not a weakly prime, because it can be changed into another prime (97964869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48982404 + 48982405.

It is an arithmetic number, because the mean of its divisors is an integer number (48982405).

Almost surely, 2^97964809 is an apocalyptic number.

It is an amenable number.

97964809 is a deficient number, since it is larger than the sum of its proper divisors (1).

97964809 is an equidigital number, since it uses as much as digits as its factorization.

97964809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 97964809 is about 9897.7173631095. The cubic root of 97964809 is about 460.9884369311.

The spelling of 97964809 in words is "ninety-seven million, nine hundred sixty-four thousand, eight hundred nine".