18004313 has 2 divisors, whose sum is σ = 18004314. Its totient is φ = 18004312.

The previous prime is 18004291. The next prime is 18004319. The reversal of 18004313 is 31340081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17530969 + 473344 = 4187^2 + 688^2 .

It is an emirp because it is prime and its reverse (31340081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18004313 - 2⁶ = 18004249 is a prime.

It is not a weakly prime, because it can be changed into another prime (18004319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9002156 + 9002157.

It is an arithmetic number, because the mean of its divisors is an integer number (9002157).

Almost surely, 2^18004313 is an apocalyptic number.

It is an amenable number.

18004313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18004313 is an equidigital number, since it uses as much as digits as its factorization.

18004313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 18004313 is about 4243.1489485994. The cubic root of 18004313 is about 262.0950697078.

Adding to 18004313 its reverse (31340081), we get a palindrome (49344394).

The spelling of 18004313 in words is "eighteen million, four thousand, three hundred thirteen".