168172897 has 2 divisors, whose sum is σ = 168172898. Its totient is φ = 168172896.

The previous prime is 168172889. The next prime is 168172981. The reversal of 168172897 is 798271861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157778721 + 10394176 = 12561^2 + 3224^2 .

It is an emirp because it is prime and its reverse (798271861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168172897 - 2³ = 168172889 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168172897.

It is not a weakly prime, because it can be changed into another prime (168172847) 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, 84086448 + 84086449.

It is an arithmetic number, because the mean of its divisors is an integer number (84086449).

Almost surely, 2^168172897 is an apocalyptic number.

It is an amenable number.

168172897 is a deficient number, since it is larger than the sum of its proper divisors (1).

168172897 is an equidigital number, since it uses as much as digits as its factorization.

168172897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 49.

The square root of 168172897 is about 12968.1493282581. The cubic root of 168172897 is about 551.9740599464.

The spelling of 168172897 in words is "one hundred sixty-eight million, one hundred seventy-two thousand, eight hundred ninety-seven".