641045641 has 4 divisors (see below), whose sum is σ = 644083984. Its totient is φ = 638007300.

The previous prime is 641045623. The next prime is 641045663. The reversal of 641045641 is 146540146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641045641 - 2⁷ = 641045513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641045611) 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, 1518855 + ... + 1519276.

It is an arithmetic number, because the mean of its divisors is an integer number (161020996).

Almost surely, 2^641045641 is an apocalyptic number.

It is an amenable number.

641045641 is a deficient number, since it is larger than the sum of its proper divisors (3038343).

641045641 is a wasteful number, since it uses less digits than its factorization.

641045641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038342.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 641045641 is about 25318.8791418578. The cubic root of 641045641 is about 862.2429467398.

Adding to 641045641 its reverse (146540146), we get a palindrome (787585787).

The spelling of 641045641 in words is "six hundred forty-one million, forty-five thousand, six hundred forty-one".