817949117 has 2 divisors, whose sum is σ = 817949118. Its totient is φ = 817949116.

The previous prime is 817949113. The next prime is 817949141. The reversal of 817949117 is 711949718.

817949117 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., 524135236 + 293813881 = 22894^2 + 17141^2 .

It is a cyclic number.

It is not a de Polignac number, because 817949117 - 2² = 817949113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817949113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408974558 + 408974559.

It is an arithmetic number, because the mean of its divisors is an integer number (408974559).

Almost surely, 2^817949117 is an apocalyptic number.

It is an amenable number.

817949117 is a deficient number, since it is larger than the sum of its proper divisors (1).

817949117 is an equidigital number, since it uses as much as digits as its factorization.

817949117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 47.

The square root of 817949117 is about 28599.8097371294. The cubic root of 817949117 is about 935.2091830863.

The spelling of 817949117 in words is "eight hundred seventeen million, nine hundred forty-nine thousand, one hundred seventeen".