18171316 has 6 divisors (see below), whose sum is σ = 31799810. Its totient is φ = 9085656.

The previous prime is 18171289. The next prime is 18171341. The reversal of 18171316 is 61317181.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 23716 = 4260^2 + 154^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2271411 + ... + 2271418.

Almost surely, 2^18171316 is an apocalyptic number.

It is an amenable number.

18171316 is a deficient number, since it is larger than the sum of its proper divisors (13628494).

18171316 is a wasteful number, since it uses less digits than its factorization.

18171316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542833 (or 4542831 counting only the distinct ones).

The product of its digits is 1008, while the sum is 28.

The square root of 18171316 is about 4262.7826592497. The cubic root of 18171316 is about 262.9029505976.

Adding to 18171316 its reverse (61317181), we get a palindrome (79488497).

The spelling of 18171316 in words is "eighteen million, one hundred seventy-one thousand, three hundred sixteen".