817124813 has 2 divisors, whose sum is σ = 817124814. Its totient is φ = 817124812.

The previous prime is 817124747. The next prime is 817124827. The reversal of 817124813 is 318421718.

817124813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805821769 + 11303044 = 28387^2 + 3362^2 .

It is a cyclic number.

It is not a de Polignac number, because 817124813 - 2⁸ = 817124557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817129813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408562406 + 408562407.

It is an arithmetic number, because the mean of its divisors is an integer number (408562407).

Almost surely, 2^817124813 is an apocalyptic number.

It is an amenable number.

817124813 is a deficient number, since it is larger than the sum of its proper divisors (1).

817124813 is an equidigital number, since it uses as much as digits as its factorization.

817124813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 35.

The square root of 817124813 is about 28585.3950995959. The cubic root of 817124813 is about 934.8949191297.

The spelling of 817124813 in words is "eight hundred seventeen million, one hundred twenty-four thousand, eight hundred thirteen".