18071317 has 4 divisors (see below), whose sum is σ = 19714176. Its totient is φ = 16428460.

The previous prime is 18071297. The next prime is 18071351. The reversal of 18071317 is 71317081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18071317 is a prime.

It is a super-2 number, since 2×18071317² = 653144996228978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821413 + ... + 821434.

It is an arithmetic number, because the mean of its divisors is an integer number (4928544).

Almost surely, 2^18071317 is an apocalyptic number.

It is an amenable number.

18071317 is a deficient number, since it is larger than the sum of its proper divisors (1642859).

18071317 is a wasteful number, since it uses less digits than its factorization.

18071317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642858.

The product of its (nonzero) digits is 1176, while the sum is 28.

The square root of 18071317 is about 4251.0371675628. The cubic root of 18071317 is about 262.4198007456.

Adding to 18071317 its reverse (71317081), we get a palindrome (89388398).

The spelling of 18071317 in words is "eighteen million, seventy-one thousand, three hundred seventeen".