851143 has 4 divisors (see below), whose sum is σ = 895960. Its totient is φ = 806328.

The previous prime is 851131. The next prime is 851153. The reversal of 851143 is 341158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341158 = 2 ⋅170579.

It is a cyclic number.

It is not a de Polignac number, because 851143 - 2⁹ = 850631 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851113) 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, 22380 + ... + 22417.

It is an arithmetic number, because the mean of its divisors is an integer number (223990).

2⁸⁵¹¹⁴³ is an apocalyptic number.

851143 is a deficient number, since it is larger than the sum of its proper divisors (44817).

851143 is a wasteful number, since it uses less digits than its factorization.

851143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44816.

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

The square root of 851143 is about 922.5741162638. The cubic root of 851143 is about 94.7692646065.

The spelling of 851143 in words is "eight hundred fifty-one thousand, one hundred forty-three".