818497213 has 2 divisors, whose sum is σ = 818497214. Its totient is φ = 818497212.

The previous prime is 818497201. The next prime is 818497237. The reversal of 818497213 is 312794818.

818497213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469068964 + 349428249 = 21658^2 + 18693^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818497213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 818497213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818497513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409248606 + 409248607.

It is an arithmetic number, because the mean of its divisors is an integer number (409248607).

Almost surely, 2^818497213 is an apocalyptic number.

It is an amenable number.

818497213 is a deficient number, since it is larger than the sum of its proper divisors (1).

818497213 is an equidigital number, since it uses as much as digits as its factorization.

818497213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 818497213 is about 28609.3902940975. The cubic root of 818497213 is about 935.4180265431.

The spelling of 818497213 in words is "eight hundred eighteen million, four hundred ninety-seven thousand, two hundred thirteen".