641104643 has 4 divisors (see below), whose sum is σ = 641325720. Its totient is φ = 640883568.

The previous prime is 641104627. The next prime is 641104649. The reversal of 641104643 is 346401146.

641104643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641104643 - 2⁴ = 641104627 is a prime.

It is a super-2 number, since 2×641104643² = 822030326552314898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641104649) 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, 106130 + ... + 112007.

It is an arithmetic number, because the mean of its divisors is an integer number (160331430).

Almost surely, 2^641104643 is an apocalyptic number.

641104643 is a deficient number, since it is larger than the sum of its proper divisors (221077).

641104643 is a wasteful number, since it uses less digits than its factorization.

641104643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221076.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 641104643 is about 25320.0442930102. The cubic root of 641104643 is about 862.2693996132.

Adding to 641104643 its reverse (346401146), we get a palindrome (987505789).

The spelling of 641104643 in words is "six hundred forty-one million, one hundred four thousand, six hundred forty-three".