18984313 has 2 divisors, whose sum is σ = 18984314. Its totient is φ = 18984312.

The previous prime is 18984311. The next prime is 18984331. The reversal of 18984313 is 31348981.

Together with next prime (18984331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18766224 + 218089 = 4332^2 + 467^2 .

It is an emirp because it is prime and its reverse (31348981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18984313 - 2¹ = 18984311 is a prime.

Together with 18984311, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18984311) 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, 9492156 + 9492157.

It is an arithmetic number, because the mean of its divisors is an integer number (9492157).

Almost surely, 2^18984313 is an apocalyptic number.

It is an amenable number.

18984313 is a deficient number, since it is larger than the sum of its proper divisors (1).

18984313 is an equidigital number, since it uses as much as digits as its factorization.

18984313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 18984313 is about 4357.0991496637. The cubic root of 18984313 is about 266.7667074300.

The spelling of 18984313 in words is "eighteen million, nine hundred eighty-four thousand, three hundred thirteen".