163916809 has 27 divisors (see below), whose sum is σ = 200424141. Its totient is φ = 133663320.

The previous prime is 163916807. The next prime is 163916843. The reversal of 163916809 is 908619361.

The square root of 163916809 is 12803.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 163916809 - 2¹ = 163916807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163916807) 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 26 ways as a sum of consecutive naturals, for example, 2778222 + ... + 2778280.

Almost surely, 2^163916809 is an apocalyptic number.

163916809 is the 12803-rd square number.

163916809 is the 6402-nd centered octagonal number.

It is an amenable number.

163916809 is a deficient number, since it is larger than the sum of its proper divisors (36507332).

163916809 is an frugal number, since it uses more digits than its factorization.

163916809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The cubic root of 163916809 is about 547.2777983944.

The spelling of 163916809 in words is "one hundred sixty-three million, nine hundred sixteen thousand, eight hundred nine".