163918193 has 8 divisors (see below), whose sum is σ = 167975808. Its totient is φ = 159871824.

The previous prime is 163918189. The next prime is 163918211. The reversal of 163918193 is 391819361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 163918193 - 2² = 163918189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163918193.

It is not an unprimeable number, because it can be changed into a prime (163918133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31880 + ... + 36662.

It is an arithmetic number, because the mean of its divisors is an integer number (20996976).

Almost surely, 2^163918193 is an apocalyptic number.

It is an amenable number.

163918193 is a deficient number, since it is larger than the sum of its proper divisors (4057615).

163918193 is an equidigital number, since it uses as much as digits as its factorization.

163918193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5623.

The product of its digits is 34992, while the sum is 41.

The square root of 163918193 is about 12803.0540497180. The cubic root of 163918193 is about 547.2793386683.

The spelling of 163918193 in words is "one hundred sixty-three million, nine hundred eighteen thousand, one hundred ninety-three".