18383513 has 2 divisors, whose sum is σ = 18383514. Its totient is φ = 18383512.

The previous prime is 18383503. The next prime is 18383549. The reversal of 18383513 is 31538381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16216729 + 2166784 = 4027^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 18383513 - 2²² = 14189209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18383513.

It is not a weakly prime, because it can be changed into another prime (18383503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9191756 + 9191757.

It is an arithmetic number, because the mean of its divisors is an integer number (9191757).

Almost surely, 2^18383513 is an apocalyptic number.

It is an amenable number.

18383513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18383513 is an equidigital number, since it uses as much as digits as its factorization.

18383513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 18383513 is about 4287.5999113723. The cubic root of 18383513 is about 263.9223495611.

The spelling of 18383513 in words is "eighteen million, three hundred eighty-three thousand, five hundred thirteen".