806851 has 4 divisors (see below), whose sum is σ = 808704. Its totient is φ = 805000.

The previous prime is 806821. The next prime is 806857. The reversal of 806851 is 158608.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 806851 - 2¹¹ = 804803 is a prime.

It is a Duffinian number.

806851 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (806857) 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 3 ways as a sum of consecutive naturals, for example, 126 + ... + 1276.

It is an arithmetic number, because the mean of its divisors is an integer number (202176).

2⁸⁰⁶⁸⁵¹ is an apocalyptic number.

806851 is a deficient number, since it is larger than the sum of its proper divisors (1853).

806851 is a wasteful number, since it uses less digits than its factorization.

806851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 806851 is about 898.2488519336. The cubic root of 806851 is about 93.0960198400.

The spelling of 806851 in words is "eight hundred six thousand, eight hundred fifty-one".