858109079 has 2 divisors, whose sum is σ = 858109080. Its totient is φ = 858109078.

The previous prime is 858109037. The next prime is 858109117. The reversal of 858109079 is 970901858.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-858109079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858109019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429054539 + 429054540.

It is an arithmetic number, because the mean of its divisors is an integer number (429054540).

Almost surely, 2^858109079 is an apocalyptic number.

858109079 is a deficient number, since it is larger than the sum of its proper divisors (1).

858109079 is an equidigital number, since it uses as much as digits as its factorization.

858109079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 858109079 is about 29293.4989204089. The cubic root of 858109079 is about 950.2710506353.

The spelling of 858109079 in words is "eight hundred fifty-eight million, one hundred nine thousand, seventy-nine".