168028009 has 2 divisors, whose sum is σ = 168028010. Its totient is φ = 168028008.

The previous prime is 168027991. The next prime is 168028033. The reversal of 168028009 is 900820861.

168028009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131606784 + 36421225 = 11472^2 + 6035^2 .

It is a cyclic number.

It is not a de Polignac number, because 168028009 - 2¹¹ = 168025961 is a prime.

It is not a weakly prime, because it can be changed into another prime (168028109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84014004 + 84014005.

It is an arithmetic number, because the mean of its divisors is an integer number (84014005).

Almost surely, 2^168028009 is an apocalyptic number.

It is an amenable number.

168028009 is a deficient number, since it is larger than the sum of its proper divisors (1).

168028009 is an equidigital number, since it uses as much as digits as its factorization.

168028009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 168028009 is about 12962.5618224177. The cubic root of 168028009 is about 551.8154981386.

The spelling of 168028009 in words is "one hundred sixty-eight million, twenty-eight thousand, nine".