858109117 has 2 divisors, whose sum is σ = 858109118. Its totient is φ = 858109116.

The previous prime is 858109079. The next prime is 858109121. The reversal of 858109117 is 711901858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856498756 + 1610361 = 29266^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 858109117 - 2¹⁹ = 857584829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 858109117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858109717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429054558 + 429054559.

It is an arithmetic number, because the mean of its divisors is an integer number (429054559).

Almost surely, 2^858109117 is an apocalyptic number.

It is an amenable number.

858109117 is a deficient number, since it is larger than the sum of its proper divisors (1).

858109117 is an equidigital number, since it uses as much as digits as its factorization.

858109117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 40.

The square root of 858109117 is about 29293.4995690170. The cubic root of 858109117 is about 950.2710646624.

The spelling of 858109117 in words is "eight hundred fifty-eight million, one hundred nine thousand, one hundred seventeen".