644131341 has 48 divisors (see below), whose sum is σ = 1084397184. Its totient is φ = 360847872.

The previous prime is 644131339. The next prime is 644131349. The reversal of 644131341 is 143131446.

644131341 is a `hidden beast` number, since 644 + 1 + 3 + 13 + 4 + 1 = 666.

It is not a de Polignac number, because 644131341 - 2¹ = 644131339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644131349) 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 47 ways as a sum of consecutive naturals, for example, 1043665 + ... + 1044281.

It is an arithmetic number, because the mean of its divisors is an integer number (22591608).

Almost surely, 2^644131341 is an apocalyptic number.

It is an amenable number.

644131341 is a deficient number, since it is larger than the sum of its proper divisors (440265843).

644131341 is a wasteful number, since it uses less digits than its factorization.

644131341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 927 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 644131341 is about 25379.7427291925. The cubic root of 644131341 is about 863.6242136697.

Adding to 644131341 its reverse (143131446), we get a palindrome (787262787).

The spelling of 644131341 in words is "six hundred forty-four million, one hundred thirty-one thousand, three hundred forty-one".