168809437 has 2 divisors, whose sum is σ = 168809438. Its totient is φ = 168809436.

The previous prime is 168809413. The next prime is 168809521. The reversal of 168809437 is 734908861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139854276 + 28955161 = 11826^2 + 5381^2 .

It is a cyclic number.

It is not a de Polignac number, because 168809437 - 2²³ = 160420829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168804437) 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, 84404718 + 84404719.

It is an arithmetic number, because the mean of its divisors is an integer number (84404719).

Almost surely, 2^168809437 is an apocalyptic number.

It is an amenable number.

168809437 is a deficient number, since it is larger than the sum of its proper divisors (1).

168809437 is an equidigital number, since it uses as much as digits as its factorization.

168809437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 168809437 is about 12992.6685865530. The cubic root of 168809437 is about 552.6695965226.

The spelling of 168809437 in words is "one hundred sixty-eight million, eight hundred nine thousand, four hundred thirty-seven".