168671689 has 2 divisors, whose sum is σ = 168671690. Its totient is φ = 168671688.

The previous prime is 168671653. The next prime is 168671747. The reversal of 168671689 is 986176861.

It is a happy number.

168671689 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., 110607289 + 58064400 = 10517^2 + 7620^2 .

It is a cyclic number.

It is not a de Polignac number, because 168671689 - 2⁹ = 168671177 is a prime.

It is a super-2 number, since 2×168671689² = 56900277340225442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168671609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84335844 + 84335845.

It is an arithmetic number, because the mean of its divisors is an integer number (84335845).

Almost surely, 2^168671689 is an apocalyptic number.

It is an amenable number.

168671689 is a deficient number, since it is larger than the sum of its proper divisors (1).

168671689 is an equidigital number, since it uses as much as digits as its factorization.

168671689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 52.

The square root of 168671689 is about 12987.3665151947. The cubic root of 168671689 is about 552.5192300317.

The spelling of 168671689 in words is "one hundred sixty-eight million, six hundred seventy-one thousand, six hundred eighty-nine".