856822279 has 4 divisors (see below), whose sum is σ = 856912600. Its totient is φ = 856731960.

The previous prime is 856822277. The next prime is 856822301. The reversal of 856822279 is 972228658.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 972228658 = 2 ⋅486114329.

It is a cyclic number.

It is not a de Polignac number, because 856822279 - 2¹ = 856822277 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 (856822273) 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 3 ways as a sum of consecutive naturals, for example, 29004 + ... + 50545.

It is an arithmetic number, because the mean of its divisors is an integer number (214228150).

Almost surely, 2^856822279 is an apocalyptic number.

856822279 is a deficient number, since it is larger than the sum of its proper divisors (90321).

856822279 is a wasteful number, since it uses less digits than its factorization.

856822279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90320.

The product of its digits is 967680, while the sum is 49.

The square root of 856822279 is about 29271.5267623676. The cubic root of 856822279 is about 949.7958117023.

The spelling of 856822279 in words is "eight hundred fifty-six million, eight hundred twenty-two thousand, two hundred seventy-nine".