856243055 has 4 divisors (see below), whose sum is σ = 1027491672. Its totient is φ = 684994440.

The previous prime is 856243043. The next prime is 856243109. The reversal of 856243055 is 550342658.

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

It is not a de Polignac number, because 856243055 - 2⁶ = 856242991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 85624301 + ... + 85624310.

It is an arithmetic number, because the mean of its divisors is an integer number (256872918).

Almost surely, 2^856243055 is an apocalyptic number.

856243055 is a deficient number, since it is larger than the sum of its proper divisors (171248617).

856243055 is a wasteful number, since it uses less digits than its factorization.

856243055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171248616.

The product of its (nonzero) digits is 144000, while the sum is 38.

The square root of 856243055 is about 29261.6311062798. The cubic root of 856243055 is about 949.5817383143.

The spelling of 856243055 in words is "eight hundred fifty-six million, two hundred forty-three thousand, fifty-five".