168323909 has 4 divisors (see below), whose sum is σ = 181271916. Its totient is φ = 155375904.

The previous prime is 168323891. The next prime is 168323927. The reversal of 168323909 is 909323861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909323861 = 103 ⋅8828387.

It is an interprime number because it is at equal distance from previous prime (168323891) and next prime (168323927).

It can be written as a sum of positive squares in 2 ways, for example, as 42211009 + 126112900 = 6497^2 + 11230^2 .

It is a cyclic number.

It is not a de Polignac number, because 168323909 - 2²⁰ = 167275333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168323929) 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 in 3 ways as a sum of consecutive naturals, for example, 6473984 + ... + 6474009.

It is an arithmetic number, because the mean of its divisors is an integer number (45317979).

Almost surely, 2^168323909 is an apocalyptic number.

It is an amenable number.

168323909 is a deficient number, since it is larger than the sum of its proper divisors (12948007).

168323909 is a wasteful number, since it uses less digits than its factorization.

168323909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12948006.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 168323909 is about 12973.9704408481. The cubic root of 168323909 is about 552.1392268094.

The spelling of 168323909 in words is "one hundred sixty-eight million, three hundred twenty-three thousand, nine hundred nine".