851047 has 4 divisors (see below), whose sum is σ = 854080. Its totient is φ = 848016.

The previous prime is 851041. The next prime is 851051. The reversal of 851047 is 740158.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851047 is a prime.

It is a Duffinian number.

851047 is a lucky 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 (851041) 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, 1047 + ... + 1672.

It is an arithmetic number, because the mean of its divisors is an integer number (213520).

2⁸⁵¹⁰⁴⁷ is an apocalyptic number.

851047 is a deficient number, since it is larger than the sum of its proper divisors (3033).

851047 is a wasteful number, since it uses less digits than its factorization.

851047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 851047 is about 922.5220864565. The cubic root of 851047 is about 94.7657014796.

Subtracting from 851047 its reverse (740158), we obtain a square (110889 = 333²).

The spelling of 851047 in words is "eight hundred fifty-one thousand, forty-seven".