18665313 has 4 divisors (see below), whose sum is σ = 24887088. Its totient is φ = 12443540.

The previous prime is 18665243. The next prime is 18665321. The reversal of 18665313 is 31356681.

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 not a de Polignac number, because 18665313 - 2⁹ = 18664801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18665333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3110883 + ... + 3110888.

It is an arithmetic number, because the mean of its divisors is an integer number (6221772).

Almost surely, 2^18665313 is an apocalyptic number.

It is an amenable number.

18665313 is a deficient number, since it is larger than the sum of its proper divisors (6221775).

18665313 is an equidigital number, since it uses as much as digits as its factorization.

18665313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6221774.

The product of its digits is 12960, while the sum is 33.

The square root of 18665313 is about 4320.3371396223. The cubic root of 18665313 is about 265.2640680891.

The spelling of 18665313 in words is "eighteen million, six hundred sixty-five thousand, three hundred thirteen".