856711 has 2 divisors, whose sum is σ = 856712. Its totient is φ = 856710.

The previous prime is 856703. The next prime is 856717. The reversal of 856711 is 117658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856711 - 2³ = 856703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856711.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428355 + 428356.

It is an arithmetic number, because the mean of its divisors is an integer number (428356).

2⁸⁵⁶⁷¹¹ is an apocalyptic number.

856711 is a deficient number, since it is larger than the sum of its proper divisors (1).

856711 is an equidigital number, since it uses as much as digits as its factorization.

856711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 856711 is about 925.5868408745. The cubic root of 856711 is about 94.9754691972.

The spelling of 856711 in words is "eight hundred fifty-six thousand, seven hundred eleven".