97818109 has 2 divisors, whose sum is σ = 97818110. Its totient is φ = 97818108.

The previous prime is 97818107. The next prime is 97818143. The reversal of 97818109 is 90181879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48958009 + 48860100 = 6997^2 + 6990^2 .

It is a cyclic number.

It is not a de Polignac number, because 97818109 - 2¹ = 97818107 is a prime.

Together with 97818107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97818107) 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, 48909054 + 48909055.

It is an arithmetic number, because the mean of its divisors is an integer number (48909055).

Almost surely, 2^97818109 is an apocalyptic number.

It is an amenable number.

97818109 is a deficient number, since it is larger than the sum of its proper divisors (1).

97818109 is an equidigital number, since it uses as much as digits as its factorization.

97818109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 97818109 is about 9890.3037870431. The cubic root of 97818109 is about 460.7582155243.

The spelling of 97818109 in words is "ninety-seven million, eight hundred eighteen thousand, one hundred nine".