18648013 has 2 divisors, whose sum is σ = 18648014. Its totient is φ = 18648012.

The previous prime is 18647983. The next prime is 18648059. The reversal of 18648013 is 31084681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 3305124 = 3917^2 + 1818^2 .

It is a cyclic number.

It is not a de Polignac number, because 18648013 - 2⁹ = 18647501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18648083) 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, 9324006 + 9324007.

It is an arithmetic number, because the mean of its divisors is an integer number (9324007).

Almost surely, 2^18648013 is an apocalyptic number.

It is an amenable number.

18648013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18648013 is an equidigital number, since it uses as much as digits as its factorization.

18648013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18648013 is about 4318.3345169174. The cubic root of 18648013 is about 265.1820891638.

The spelling of 18648013 in words is "eighteen million, six hundred forty-eight thousand, thirteen".