641944759 has 2 divisors, whose sum is σ = 641944760. Its totient is φ = 641944758.

The previous prime is 641944733. The next prime is 641944817. The reversal of 641944759 is 957449146.

641944759 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641944759 - 2⁷ = 641944631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641744759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320972379 + 320972380.

It is an arithmetic number, because the mean of its divisors is an integer number (320972380).

Almost surely, 2^641944759 is an apocalyptic number.

641944759 is a deficient number, since it is larger than the sum of its proper divisors (1).

641944759 is an equidigital number, since it uses as much as digits as its factorization.

641944759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 641944759 is about 25336.6288010067. The cubic root of 641944759 is about 862.6458800789.

The spelling of 641944759 in words is "six hundred forty-one million, nine hundred forty-four thousand, seven hundred fifty-nine".