856547 has 2 divisors, whose sum is σ = 856548. Its totient is φ = 856546.

The previous prime is 856529. The next prime is 856549. The reversal of 856547 is 745658.

856547 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 856547 - 2⁶ = 856483 is a prime.

Together with 856549, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (856549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428273 + 428274.

It is an arithmetic number, because the mean of its divisors is an integer number (428274).

2⁸⁵⁶⁵⁴⁷ is an apocalyptic number.

856547 is a deficient number, since it is larger than the sum of its proper divisors (1).

856547 is an equidigital number, since it uses as much as digits as its factorization.

856547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The square root of 856547 is about 925.4982441907. The cubic root of 856547 is about 94.9694084326.

Subtracting from 856547 its reverse (745658), we obtain a square (110889 = 333²).

The spelling of 856547 in words is "eight hundred fifty-six thousand, five hundred forty-seven".