18816533 has 2 divisors, whose sum is σ = 18816534. Its totient is φ = 18816532.

The previous prime is 18816503. The next prime is 18816559. The reversal of 18816533 is 33561881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12945604 + 5870929 = 3598^2 + 2423^2 .

It is an emirp because it is prime and its reverse (33561881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18816533 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18816493 and 18816502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18816503) 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, 9408266 + 9408267.

It is an arithmetic number, because the mean of its divisors is an integer number (9408267).

Almost surely, 2^18816533 is an apocalyptic number.

It is an amenable number.

18816533 is a deficient number, since it is larger than the sum of its proper divisors (1).

18816533 is an equidigital number, since it uses as much as digits as its factorization.

18816533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 18816533 is about 4337.8027848209. The cubic root of 18816533 is about 265.9785018524.

The spelling of 18816533 in words is "eighteen million, eight hundred sixteen thousand, five hundred thirty-three".