856444877 has 2 divisors, whose sum is σ = 856444878. Its totient is φ = 856444876.

The previous prime is 856444873. The next prime is 856444903. The reversal of 856444877 is 778444658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819161641 + 37283236 = 28621^2 + 6106^2 .

It is a cyclic number.

It is not a de Polignac number, because 856444877 - 2² = 856444873 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856444873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428222438 + 428222439.

It is an arithmetic number, because the mean of its divisors is an integer number (428222439).

Almost surely, 2^856444877 is an apocalyptic number.

It is an amenable number.

856444877 is a deficient number, since it is larger than the sum of its proper divisors (1).

856444877 is an equidigital number, since it uses as much as digits as its factorization.

856444877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6021120, while the sum is 53.

The square root of 856444877 is about 29265.0794805003. The cubic root of 856444877 is about 949.6563399628.

The spelling of 856444877 in words is "eight hundred fifty-six million, four hundred forty-four thousand, eight hundred seventy-seven".