853866841 has 3 divisors (see below), whose sum is σ = 853896063. Its totient is φ = 853837620.

The previous prime is 853866809. The next prime is 853866851. The reversal of 853866841 is 148668358.

The square root of 853866841 is 29221.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 148668358 = 2 ⋅74334179.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 832899600 = 4579^2 + 28860^2 .

It is not a de Polignac number, because 853866841 - 2⁵ = 853866809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853866851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14611 + ... + 43831.

It is an arithmetic number, because the mean of its divisors is an integer number (284632021).

Almost surely, 2^853866841 is an apocalyptic number.

853866841 is the 29221-st square number.

853866841 is the 14611-st centered octagonal number.

It is an amenable number.

853866841 is a deficient number, since it is larger than the sum of its proper divisors (29222).

853866841 is an frugal number, since it uses more digits than its factorization.

853866841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58442 (or 29221 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 49.

The cubic root of 853866841 is about 948.7025097928.

Multiplying 853866841 by its sum of digits (49), we get a square (41839475209 = 204547²).

The spelling of 853866841 in words is "eight hundred fifty-three million, eight hundred sixty-six thousand, eight hundred forty-one".