813910817 has 2 divisors, whose sum is σ = 813910818. Its totient is φ = 813910816.

The previous prime is 813910813. The next prime is 813910849. The reversal of 813910817 is 718019318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487349776 + 326561041 = 22076^2 + 18071^2 .

It is a cyclic number.

It is not a de Polignac number, because 813910817 - 2² = 813910813 is a prime.

It is not a weakly prime, because it can be changed into another prime (813910813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406955408 + 406955409.

It is an arithmetic number, because the mean of its divisors is an integer number (406955409).

Almost surely, 2^813910817 is an apocalyptic number.

It is an amenable number.

813910817 is a deficient number, since it is larger than the sum of its proper divisors (1).

813910817 is an equidigital number, since it uses as much as digits as its factorization.

813910817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 813910817 is about 28529.1222612964. The cubic root of 813910817 is about 933.6675682043.

The spelling of 813910817 in words is "eight hundred thirteen million, nine hundred ten thousand, eight hundred seventeen".