851868143 has 4 divisors (see below), whose sum is σ = 973563600. Its totient is φ = 730172688.

The previous prime is 851868109. The next prime is 851868151. The reversal of 851868143 is 341868158.

It is a happy number.

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

It is not a de Polignac number, because 851868143 - 2¹⁰ = 851867119 is a prime.

It is a super-3 number, since 3×851868143³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851868094 and 851868103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851868343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60847718 + ... + 60847731.

It is an arithmetic number, because the mean of its divisors is an integer number (243390900).

Almost surely, 2^851868143 is an apocalyptic number.

851868143 is a deficient number, since it is larger than the sum of its proper divisors (121695457).

851868143 is a wasteful number, since it uses less digits than its factorization.

851868143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121695456.

The product of its digits is 184320, while the sum is 44.

The square root of 851868143 is about 29186.7802780642. The cubic root of 851868143 is about 947.9617029370.

The spelling of 851868143 in words is "eight hundred fifty-one million, eight hundred sixty-eight thousand, one hundred forty-three".