812851 has 8 divisors (see below), whose sum is σ = 904064. Its totient is φ = 725760.

The previous prime is 812849. The next prime is 812857. The reversal of 812851 is 158218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812851 - 2¹ = 812849 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (812857) 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 in 7 ways as a sum of consecutive naturals, for example, 606 + ... + 1411.

It is an arithmetic number, because the mean of its divisors is an integer number (113008).

2⁸¹²⁸⁵¹ is an apocalyptic number.

812851 is a deficient number, since it is larger than the sum of its proper divisors (91213).

812851 is a wasteful number, since it uses less digits than its factorization.

812851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061.

The product of its digits is 640, while the sum is 25.

The square root of 812851 is about 901.5824976118. The cubic root of 812851 is about 93.3262140261.

The spelling of 812851 in words is "eight hundred twelve thousand, eight hundred fifty-one".