18173163 has 4 divisors (see below), whose sum is σ = 24230888. Its totient is φ = 12115440.

The previous prime is 18173159. The next prime is 18173167. The reversal of 18173163 is 36137181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36137181 = 3 ⋅12045727.

It is an interprime number because it is at equal distance from previous prime (18173159) and next prime (18173167).

It is not a de Polignac number, because 18173163 - 2² = 18173159 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 18173163.

It is not an unprimeable number, because it can be changed into a prime (18173167) 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 3 ways as a sum of consecutive naturals, for example, 3028858 + ... + 3028863.

It is an arithmetic number, because the mean of its divisors is an integer number (6057722).

Almost surely, 2^18173163 is an apocalyptic number.

18173163 is a deficient number, since it is larger than the sum of its proper divisors (6057725).

18173163 is an equidigital number, since it uses as much as digits as its factorization.

18173163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6057724.

The product of its digits is 3024, while the sum is 30.

The square root of 18173163 is about 4262.9992962702. Note that the first 3 decimals coincide. The cubic root of 18173163 is about 262.9118577730.

It can be divided in two parts, 18173 and 163, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 18173163 in words is "eighteen million, one hundred seventy-three thousand, one hundred sixty-three".