168209143 has 4 divisors (see below), whose sum is σ = 175522608. Its totient is φ = 160895680.

The previous prime is 168209117. The next prime is 168209149. The reversal of 168209143 is 341902861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341902861 = 17 ⋅20111933.

It is a cyclic number.

It is not a de Polignac number, because 168209143 - 2⁹ = 168208631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168209099 and 168209108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168209149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3656698 + ... + 3656743.

It is an arithmetic number, because the mean of its divisors is an integer number (43880652).

Almost surely, 2^168209143 is an apocalyptic number.

168209143 is a deficient number, since it is larger than the sum of its proper divisors (7313465).

168209143 is an equidigital number, since it uses as much as digits as its factorization.

168209143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313464.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 168209143 is about 12969.5467538384. The cubic root of 168209143 is about 552.0137124210.

The spelling of 168209143 in words is "one hundred sixty-eight million, two hundred nine thousand, one hundred forty-three".