851223 has 4 divisors (see below), whose sum is σ = 1134968. Its totient is φ = 567480.

The previous prime is 851209. The next prime is 851231. The reversal of 851223 is 322158.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 851223 - 2⁶ = 851159 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141868 + ... + 141873.

It is an arithmetic number, because the mean of its divisors is an integer number (283742).

2⁸⁵¹²²³ is an apocalyptic number.

851223 is a deficient number, since it is larger than the sum of its proper divisors (283745).

851223 is a wasteful number, since it uses less digits than its factorization.

851223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283744.

The product of its digits is 480, while the sum is 21.

The square root of 851223 is about 922.6174721953. The cubic root of 851223 is about 94.7722336742.

The spelling of 851223 in words is "eight hundred fifty-one thousand, two hundred twenty-three".