18317313 has 32 divisors (see below), whose sum is σ = 32843520. Its totient is φ = 9849600.

The previous prime is 18317309. The next prime is 18317323. The reversal of 18317313 is 31371381.

It is not a de Polignac number, because 18317313 - 2² = 18317309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18317323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 363 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (1026360).

It is a Proth number, since it is equal to 559 ⋅ 2¹⁵ + 1 and 559 < 2¹⁵.

Almost surely, 2^18317313 is an apocalyptic number.

It is an amenable number.

18317313 is a deficient number, since it is larger than the sum of its proper divisors (14526207).

18317313 is a wasteful number, since it uses less digits than its factorization.

18317313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5734 (or 5728 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 18317313 is about 4279.8730121348. The cubic root of 18317313 is about 263.6051690940.

Adding to 18317313 its reverse (31371381), we get a palindrome (49688694).

The spelling of 18317313 in words is "eighteen million, three hundred seventeen thousand, three hundred thirteen".