801851 has 4 divisors (see below), whose sum is σ = 808104. Its totient is φ = 795600.

The previous prime is 801841. The next prime is 801859. The reversal of 801851 is 158108.

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-801851 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 801851.

It is not an unprimeable number, because it can be changed into a prime (801859) 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, 2930 + ... + 3191.

It is an arithmetic number, because the mean of its divisors is an integer number (202026).

2⁸⁰¹⁸⁵¹ is an apocalyptic number.

801851 is a deficient number, since it is larger than the sum of its proper divisors (6253).

801851 is a wasteful number, since it uses less digits than its factorization.

801851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6252.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 801851 is about 895.4613336152. The cubic root of 801851 is about 92.9033180321.

Adding to 801851 its reverse (158108), we get a palindrome (959959).

The spelling of 801851 in words is "eight hundred one thousand, eight hundred fifty-one".