16318513 has 4 divisors (see below), whose sum is σ = 16376868. Its totient is φ = 16260160.

The previous prime is 16318507. The next prime is 16318553. The reversal of 16318513 is 31581361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31581361 = 7 ⋅4511623.

It can be written as a sum of positive squares in 2 ways, for example, as 4981824 + 11336689 = 2232^2 + 3367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16318513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16318553) 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, 28756 + ... + 29317.

It is an arithmetic number, because the mean of its divisors is an integer number (4094217).

Almost surely, 2^16318513 is an apocalyptic number.

It is an amenable number.

16318513 is a deficient number, since it is larger than the sum of its proper divisors (58355).

16318513 is an equidigital number, since it uses as much as digits as its factorization.

16318513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58354.

The product of its digits is 2160, while the sum is 28.

The square root of 16318513 is about 4039.6179274778. The cubic root of 16318513 is about 253.6453240996.

Adding to 16318513 its reverse (31581361), we get a palindrome (47899874).

The spelling of 16318513 in words is "sixteen million, three hundred eighteen thousand, five hundred thirteen".