850681 has 4 divisors (see below), whose sum is σ = 916132. Its totient is φ = 785232.

The previous prime is 850679. The next prime is 850691. The reversal of 850681 is 186058.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 210681 + 640000 = 459^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 850681 - 2¹ = 850679 is a prime.

It is a super-2 number, since 2×850681² = 1447316327522, which contains 22 as substring.

It is a Duffinian number.

850681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (850631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32706 + ... + 32731.

It is an arithmetic number, because the mean of its divisors is an integer number (229033).

2⁸⁵⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

850681 is a deficient number, since it is larger than the sum of its proper divisors (65451).

850681 is a wasteful number, since it uses less digits than its factorization.

850681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65450.

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

The square root of 850681 is about 922.3236958899. The cubic root of 850681 is about 94.7521145997.

The spelling of 850681 in words is "eight hundred fifty thousand, six hundred eighty-one".