641244641 has 16 divisors (see below), whose sum is σ = 715806720. Its totient is φ = 571607040.

The previous prime is 641244631. The next prime is 641244647. The reversal of 641244641 is 146442146.

641244641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 641244641 - 2¹⁸ = 640982497 is a prime.

It is a super-2 number, since 2×641244641² = 822389379222437762, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641244598 and 641244607.

It is not an unprimeable number, because it can be changed into a prime (641244647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11825 + ... + 37713.

It is an arithmetic number, because the mean of its divisors is an integer number (44737920).

Almost surely, 2^641244641 is an apocalyptic number.

It is an amenable number.

641244641 is a deficient number, since it is larger than the sum of its proper divisors (74562079).

641244641 is a wasteful number, since it uses less digits than its factorization.

641244641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25984.

The product of its digits is 18432, while the sum is 32.

The square root of 641244641 is about 25322.8087107256. The cubic root of 641244641 is about 862.3321596253.

Adding to 641244641 its reverse (146442146), we get a palindrome (787686787).

The spelling of 641244641 in words is "six hundred forty-one million, two hundred forty-four thousand, six hundred forty-one".