18824513 has 2 divisors, whose sum is σ = 18824514. Its totient is φ = 18824512.

The previous prime is 18824501. The next prime is 18824537. The reversal of 18824513 is 31542881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17707264 + 1117249 = 4208^2 + 1057^2 .

It is an emirp because it is prime and its reverse (31542881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18824513 - 2¹⁰ = 18823489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18824513.

It is not a weakly prime, because it can be changed into another prime (18824563) 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, 9412256 + 9412257.

It is an arithmetic number, because the mean of its divisors is an integer number (9412257).

Almost surely, 2^18824513 is an apocalyptic number.

It is an amenable number.

18824513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18824513 is an equidigital number, since it uses as much as digits as its factorization.

18824513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 32.

The square root of 18824513 is about 4338.7225078357. The cubic root of 18824513 is about 266.0160966007.

The spelling of 18824513 in words is "eighteen million, eight hundred twenty-four thousand, five hundred thirteen".