641840839 has 2 divisors, whose sum is σ = 641840840. Its totient is φ = 641840838.

The previous prime is 641840807. The next prime is 641840851. The reversal of 641840839 is 938048146.

641840839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641840839 - 2⁵ = 641840807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 641840795 and 641840804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641840239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320920419 + 320920420.

It is an arithmetic number, because the mean of its divisors is an integer number (320920420).

Almost surely, 2^641840839 is an apocalyptic number.

641840839 is a deficient number, since it is larger than the sum of its proper divisors (1).

641840839 is an equidigital number, since it uses as much as digits as its factorization.

641840839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 641840839 is about 25334.5779321464. The cubic root of 641840839 is about 862.5993283071.

The spelling of 641840839 in words is "six hundred forty-one million, eight hundred forty thousand, eight hundred thirty-nine".