18983213 has 2 divisors, whose sum is σ = 18983214. Its totient is φ = 18983212.

The previous prime is 18983201. The next prime is 18983219. The reversal of 18983213 is 31238981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18550249 + 432964 = 4307^2 + 658^2 .

It is an emirp because it is prime and its reverse (31238981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18983213 - 2¹⁰ = 18982189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18983219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9491606 + 9491607.

It is an arithmetic number, because the mean of its divisors is an integer number (9491607).

Almost surely, 2^18983213 is an apocalyptic number.

It is an amenable number.

18983213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18983213 is an equidigital number, since it uses as much as digits as its factorization.

18983213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 18983213 is about 4356.9729170607. The cubic root of 18983213 is about 266.7615549471.

The spelling of 18983213 in words is "eighteen million, nine hundred eighty-three thousand, two hundred thirteen".