856111079 has 4 divisors (see below), whose sum is σ = 857422776. Its totient is φ = 854799384.

The previous prime is 856111073. The next prime is 856111127. The reversal of 856111079 is 970111658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 856111079 - 2⁸ = 856110823 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 (856111073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654869 + ... + 656174.

It is an arithmetic number, because the mean of its divisors is an integer number (214355694).

Almost surely, 2^856111079 is an apocalyptic number.

856111079 is a deficient number, since it is larger than the sum of its proper divisors (1311697).

856111079 is a wasteful number, since it uses less digits than its factorization.

856111079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311696.

The product of its (nonzero) digits is 15120, while the sum is 38.

The square root of 856111079 is about 29259.3759161059. The cubic root of 856111079 is about 949.5329482587.

The spelling of 856111079 in words is "eight hundred fifty-six million, one hundred eleven thousand, seventy-nine".