168143909 has 4 divisors (see below), whose sum is σ = 168847680. Its totient is φ = 167440140.

The previous prime is 168143897. The next prime is 168143917. The reversal of 168143909 is 909341861.

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.

It is a cyclic number.

It is not a de Polignac number, because 168143909 - 2²⁴ = 151366693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168143929) 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, 351527 + ... + 352004.

It is an arithmetic number, because the mean of its divisors is an integer number (42211920).

Almost surely, 2^168143909 is an apocalyptic number.

It is an amenable number.

168143909 is a deficient number, since it is larger than the sum of its proper divisors (703771).

168143909 is an equidigital number, since it uses as much as digits as its factorization.

168143909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703770.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 168143909 is about 12967.0316186859. The cubic root of 168143909 is about 551.9423434931.

The spelling of 168143909 in words is "one hundred sixty-eight million, one hundred forty-three thousand, nine hundred nine".