856206877 has 2 divisors, whose sum is σ = 856206878. Its totient is φ = 856206876.

The previous prime is 856206863. The next prime is 856206913. The reversal of 856206877 is 778602658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 774286276 + 81920601 = 27826^2 + 9051^2 .

It is a cyclic number.

It is not a de Polignac number, because 856206877 - 2⁷ = 856206749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856206877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856206277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428103438 + 428103439.

It is an arithmetic number, because the mean of its divisors is an integer number (428103439).

Almost surely, 2^856206877 is an apocalyptic number.

It is an amenable number.

856206877 is a deficient number, since it is larger than the sum of its proper divisors (1).

856206877 is an equidigital number, since it uses as much as digits as its factorization.

856206877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 856206877 is about 29261.0129182159. The cubic root of 856206877 is about 949.5683642100.

The spelling of 856206877 in words is "eight hundred fifty-six million, two hundred six thousand, eight hundred seventy-seven".