818303513 has 2 divisors, whose sum is σ = 818303514. Its totient is φ = 818303512.

The previous prime is 818303503. The next prime is 818303531. The reversal of 818303513 is 315303818.

818303513 = 20227² + 20228².

Together with next prime (818303531) 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., 409171984 + 409131529 = 20228^2 + 20227^2 .

It is a cyclic number.

It is not a de Polignac number, because 818303513 - 2¹⁰ = 818302489 is a prime.

It is equal to p_42038825 and since 818303513 and 42038825 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 818303513.

It is not a weakly prime, because it can be changed into another prime (818303503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409151756 + 409151757.

It is an arithmetic number, because the mean of its divisors is an integer number (409151757).

Almost surely, 2^818303513 is an apocalyptic number.

818303513 is the 20228-th centered square number.

It is an amenable number.

818303513 is a deficient number, since it is larger than the sum of its proper divisors (1).

818303513 is an equidigital number, since it uses as much as digits as its factorization.

818303513 is an evil number, because the sum of its binary digits is even.

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

The square root of 818303513 is about 28606.0048416412. The cubic root of 818303513 is about 935.3442308258.

The spelling of 818303513 in words is "eight hundred eighteen million, three hundred three thousand, five hundred thirteen".