856213 has 2 divisors, whose sum is σ = 856214. Its totient is φ = 856212.

The previous prime is 856187. The next prime is 856237. The reversal of 856213 is 312658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 40804 = 903^2 + 202^2 .

It is a cyclic number.

It is not a de Polignac number, because 856213 - 2⁵ = 856181 is a prime.

856213 is a lucky number.

It is equal to p₆₈₀₆₅ and since 856213 and 68065 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428106 + 428107.

It is an arithmetic number, because the mean of its divisors is an integer number (428107).

2⁸⁵⁶²¹³ is an apocalyptic number.

It is an amenable number.

856213 is a deficient number, since it is larger than the sum of its proper divisors (1).

856213 is an equidigital number, since it uses as much as digits as its factorization.

856213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 856213 is about 925.3177832507. The cubic root of 856213 is about 94.9570627757.

The spelling of 856213 in words is "eight hundred fifty-six thousand, two hundred thirteen".