18343313 has 2 divisors, whose sum is σ = 18343314. Its totient is φ = 18343312.

The previous prime is 18343291. The next prime is 18343319. The reversal of 18343313 is 31334381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 4631104 = 3703^2 + 2152^2 .

It is a cyclic number.

It is not a de Polignac number, because 18343313 - 2¹⁸ = 18081169 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18343319) 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 as a sum of consecutive naturals, namely, 9171656 + 9171657.

It is an arithmetic number, because the mean of its divisors is an integer number (9171657).

Almost surely, 2^18343313 is an apocalyptic number.

It is an amenable number.

18343313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343313 is an equidigital number, since it uses as much as digits as its factorization.

18343313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 18343313 is about 4282.9094083345. The cubic root of 18343313 is about 263.7298324689.

Adding to 18343313 its reverse (31334381), we get a palindrome (49677694).

The spelling of 18343313 in words is "eighteen million, three hundred forty-three thousand, three hundred thirteen".