97166809 has 2 divisors, whose sum is σ = 97166810. Its totient is φ = 97166808.

The previous prime is 97166767. The next prime is 97166819. The reversal of 97166809 is 90866179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81956809 + 15210000 = 9053^2 + 3900^2 .

It is an emirp because it is prime and its reverse (90866179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97166809 - 2⁷ = 97166681 is a prime.

It is not a weakly prime, because it can be changed into another prime (97166819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48583404 + 48583405.

It is an arithmetic number, because the mean of its divisors is an integer number (48583405).

Almost surely, 2^97166809 is an apocalyptic number.

It is an amenable number.

97166809 is a deficient number, since it is larger than the sum of its proper divisors (1).

97166809 is an equidigital number, since it uses as much as digits as its factorization.

97166809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 97166809 is about 9857.3226080919. The cubic root of 97166809 is about 459.7333189588.

The spelling of 97166809 in words is "ninety-seven million, one hundred sixty-six thousand, eight hundred nine".