851441 has 4 divisors (see below), whose sum is σ = 855012. Its totient is φ = 847872.

The previous prime is 851423. The next prime is 851449. The reversal of 851441 is 144158.

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 817216 + 34225 = 904^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 851441 - 2¹⁰ = 850417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851449) 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, 1400 + ... + 1913.

It is an arithmetic number, because the mean of its divisors is an integer number (213753).

2⁸⁵¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

851441 is a deficient number, since it is larger than the sum of its proper divisors (3571).

851441 is a wasteful number, since it uses less digits than its factorization.

851441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570.

The product of its digits is 640, while the sum is 23.

The square root of 851441 is about 922.7356067693. The cubic root of 851441 is about 94.7803234397.

Adding to 851441 its reverse (144158), we get a palindrome (995599).

The spelling of 851441 in words is "eight hundred fifty-one thousand, four hundred forty-one".