856609867 has 2 divisors, whose sum is σ = 856609868. Its totient is φ = 856609866.

The previous prime is 856609799. The next prime is 856609891. The reversal of 856609867 is 768906658.

It is a happy number.

856609867 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 856609867 - 2⁷ = 856609739 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (856609367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428304933 + 428304934.

It is an arithmetic number, because the mean of its divisors is an integer number (428304934).

Almost surely, 2^856609867 is an apocalyptic number.

856609867 is a deficient number, since it is larger than the sum of its proper divisors (1).

856609867 is an equidigital number, since it uses as much as digits as its factorization.

856609867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The square root of 856609867 is about 29267.8982333887. The cubic root of 856609867 is about 949.7173182944.

It can be divided in two parts, 856609 and 867, that added together give a square (857476 = 926²).

The spelling of 856609867 in words is "eight hundred fifty-six million, six hundred nine thousand, eight hundred sixty-seven".