851081 has 12 divisors (see below), whose sum is σ = 1080720. Its totient is φ = 662760.

The previous prime is 851057. The next prime is 851087. The reversal of 851081 is 180158.

It is not a de Polignac number, because 851081 - 2⁶ = 851017 is a prime.

It is a super-2 number, since 2×851081² = 1448677737122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851087) 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 11 ways as a sum of consecutive naturals, for example, 251 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (90060).

2⁸⁵¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

851081 is a deficient number, since it is larger than the sum of its proper divisors (229639).

851081 is a wasteful number, since it uses less digits than its factorization.

851081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604 (or 1597 counting only the distinct ones).

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

The square root of 851081 is about 922.5405140155. The cubic root of 851081 is about 94.7669634510.

The spelling of 851081 in words is "eight hundred fifty-one thousand, eighty-one".