851206 has 4 divisors (see below), whose sum is σ = 1276812. Its totient is φ = 425602.

The previous prime is 851203. The next prime is 851209. The reversal of 851206 is 602158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 602158 = 2 ⋅301079.

It is an interprime number because it is at equal distance from previous prime (851203) and next prime (851209).

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212800 + ... + 212803.

It is an arithmetic number, because the mean of its divisors is an integer number (319203).

2⁸⁵¹²⁰⁶ is an apocalyptic number.

851206 is a deficient number, since it is larger than the sum of its proper divisors (425606).

851206 is a wasteful number, since it uses less digits than its factorization.

851206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425605.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 851206 is about 922.6082592303. The cubic root of 851206 is about 94.7716027629.

The spelling of 851206 in words is "eight hundred fifty-one thousand, two hundred six".