18318513 has 8 divisors (see below), whose sum is σ = 25020576. Its totient is φ = 11914400.

The previous prime is 18318499. The next prime is 18318523. The reversal of 18318513 is 31581381.

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

It is a cyclic number.

It is not a de Polignac number, because 18318513 - 2⁶ = 18318449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18318523) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 74343 + ... + 74588.

It is an arithmetic number, because the mean of its divisors is an integer number (3127572).

Almost surely, 2^18318513 is an apocalyptic number.

It is an amenable number.

18318513 is a deficient number, since it is larger than the sum of its proper divisors (6702063).

18318513 is a wasteful number, since it uses less digits than its factorization.

18318513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148975.

The product of its digits is 2880, while the sum is 30.

The square root of 18318513 is about 4280.0132009142. The cubic root of 18318513 is about 263.6109253840.

Adding to 18318513 its reverse (31581381), we get a palindrome (49899894).

The spelling of 18318513 in words is "eighteen million, three hundred eighteen thousand, five hundred thirteen".