5641806421 has 4 divisors (see below), whose sum is σ = 5836351500. Its totient is φ = 5447261344.

The previous prime is 5641806419. The next prime is 5641806427. The reversal of 5641806421 is 1246081465.

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 4119714225 + 1522092196 = 64185^2 + 39014^2 .

It is a cyclic number.

It is not a de Polignac number, because 5641806421 - 2¹ = 5641806419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5641806427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97272496 + ... + 97272553.

It is an arithmetic number, because the mean of its divisors is an integer number (1459087875).

Almost surely, 2^5641806421 is an apocalyptic number.

It is an amenable number.

5641806421 is a deficient number, since it is larger than the sum of its proper divisors (194545079).

5641806421 is a wasteful number, since it uses less digits than its factorization.

5641806421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194545078.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 5641806421 is about 75111.9592408559. The cubic root of 5641806421 is about 1780.2161102967.

Adding to 5641806421 its reverse (1246081465), we get a palindrome (6887887886).

The spelling of 5641806421 in words is "five billion, six hundred forty-one million, eight hundred six thousand, four hundred twenty-one".