169143809 has 4 divisors (see below), whose sum is σ = 169324500. Its totient is φ = 168963120.

The previous prime is 169143773. The next prime is 169143841. The reversal of 169143809 is 908341961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908341961 = 1451 ⋅626011.

It can be written as a sum of positive squares in 2 ways, for example, as 74995600 + 94148209 = 8660^2 + 9703^2 .

It is a cyclic number.

It is not a de Polignac number, because 169143809 - 2¹² = 169139713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (169143509) 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, 88934 + ... + 90815.

It is an arithmetic number, because the mean of its divisors is an integer number (42331125).

Almost surely, 2^169143809 is an apocalyptic number.

It is an amenable number.

169143809 is a deficient number, since it is larger than the sum of its proper divisors (180691).

169143809 is an equidigital number, since it uses as much as digits as its factorization.

169143809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180690.

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

The square root of 169143809 is about 13005.5299392220. The cubic root of 169143809 is about 553.0342589142.

The spelling of 169143809 in words is "one hundred sixty-nine million, one hundred forty-three thousand, eight hundred nine".