18013313 has 2 divisors, whose sum is σ = 18013314. Its totient is φ = 18013312.

The previous prime is 18013297. The next prime is 18013357. The reversal of 18013313 is 31331081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13965169 + 4048144 = 3737^2 + 2012^2 .

It is an emirp because it is prime and its reverse (31331081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18013313 - 2⁴ = 18013297 is a prime.

It is not a weakly prime, because it can be changed into another prime (18013213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006656 + 9006657.

It is an arithmetic number, because the mean of its divisors is an integer number (9006657).

Almost surely, 2^18013313 is an apocalyptic number.

It is an amenable number.

18013313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18013313 is an equidigital number, since it uses as much as digits as its factorization.

18013313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 18013313 is about 4244.2093492192. The cubic root of 18013313 is about 262.1387344802.

Adding to 18013313 its reverse (31331081), we get a palindrome (49344394).

The spelling of 18013313 in words is "eighteen million, thirteen thousand, three hundred thirteen".