641840807 has 2 divisors, whose sum is σ = 641840808. Its totient is φ = 641840806.

The previous prime is 641840713. The next prime is 641840839. The reversal of 641840807 is 708048146.

641840807 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 641840807 - 2¹² = 641836711 is a prime.

It is a super-2 number, since 2×641840807² = 823919243060822498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641845807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320920403 + 320920404.

It is an arithmetic number, because the mean of its divisors is an integer number (320920404).

Almost surely, 2^641840807 is an apocalyptic number.

641840807 is a deficient number, since it is larger than the sum of its proper divisors (1).

641840807 is an equidigital number, since it uses as much as digits as its factorization.

641840807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 641840807 is about 25334.5773005985. The cubic root of 641840807 is about 862.5993139717.

The spelling of 641840807 in words is "six hundred forty-one million, eight hundred forty thousand, eight hundred seven".