168712009 has 4 divisors (see below), whose sum is σ = 169747216. Its totient is φ = 167676804.

The previous prime is 168711989. The next prime is 168712057. The reversal of 168712009 is 900217861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900217861 = 23 ⋅39139907.

It is a cyclic number.

It is not a de Polignac number, because 168712009 - 2⁹ = 168711497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168712079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517359 + ... + 517684.

It is an arithmetic number, because the mean of its divisors is an integer number (42436804).

Almost surely, 2^168712009 is an apocalyptic number.

It is an amenable number.

168712009 is a deficient number, since it is larger than the sum of its proper divisors (1035207).

168712009 is a wasteful number, since it uses less digits than its factorization.

168712009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035206.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 168712009 is about 12988.9187001844. The cubic root of 168712009 is about 552.5632520419.

The spelling of 168712009 in words is "one hundred sixty-eight million, seven hundred twelve thousand, nine".