18315013 has 2 divisors, whose sum is σ = 18315014. Its totient is φ = 18315012.

The previous prime is 18314999. The next prime is 18315019. The reversal of 18315013 is 31051381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 859329 = 4178^2 + 927^2 .

It is a cyclic number.

It is not a de Polignac number, because 18315013 - 2⁵ = 18314981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18315019) 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, 9157506 + 9157507.

It is an arithmetic number, because the mean of its divisors is an integer number (9157507).

Almost surely, 2^18315013 is an apocalyptic number.

It is an amenable number.

18315013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18315013 is an equidigital number, since it uses as much as digits as its factorization.

18315013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 18315013 is about 4279.6043041384. The cubic root of 18315013 is about 263.5941355021.

Adding to 18315013 its reverse (31051381), we get a palindrome (49366394).

The spelling of 18315013 in words is "eighteen million, three hundred fifteen thousand, thirteen".