856179109 has 8 divisors (see below), whose sum is σ = 909641880. Its totient is φ = 803060736.

The previous prime is 856179101. The next prime is 856179161. The reversal of 856179109 is 901971658.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 506115009 + 350064100 = 22497^2 + 18710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856179109 - 2³ = 856179101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856179101) 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 in 7 ways as a sum of consecutive naturals, for example, 80964 + ... + 90925.

It is an arithmetic number, because the mean of its divisors is an integer number (113705235).

Almost surely, 2^856179109 is an apocalyptic number.

It is an amenable number.

856179109 is a deficient number, since it is larger than the sum of its proper divisors (53462771).

856179109 is a wasteful number, since it uses less digits than its factorization.

856179109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172199.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 856179109 is about 29260.5384263516. The cubic root of 856179109 is about 949.5580988173.

The spelling of 856179109 in words is "eight hundred fifty-six million, one hundred seventy-nine thousand, one hundred nine".