5641821 has 12 divisors (see below), whose sum is σ = 8174140. Its totient is φ = 3749760.

The previous prime is 5641819. The next prime is 5641837. The reversal of 5641821 is 1281465.

It can be written as a sum of positive squares in 2 ways, for example, as 416025 + 5225796 = 645^2 + 2286^2 .

It is not a de Polignac number, because 5641821 - 2¹ = 5641819 is a prime.

It is a Duffinian number.

5641821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5641861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3045 + ... + 4533.

Almost surely, 2^5641821 is an apocalyptic number.

It is an amenable number.

5641821 is a deficient number, since it is larger than the sum of its proper divisors (2532319).

5641821 is a wasteful number, since it uses less digits than its factorization.

5641821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1913 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 5641821 is about 2375.2517761282. The cubic root of 5641821 is about 178.0217643715.

The spelling of 5641821 in words is "five million, six hundred forty-one thousand, eight hundred twenty-one".