641940727 has 2 divisors, whose sum is σ = 641940728. Its totient is φ = 641940726.

The previous prime is 641940697. The next prime is 641940751. The reversal of 641940727 is 727049146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641940727 - 2¹¹ = 641938679 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641940727.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641940797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320970363 + 320970364.

It is an arithmetic number, because the mean of its divisors is an integer number (320970364).

Almost surely, 2^641940727 is an apocalyptic number.

641940727 is a deficient number, since it is larger than the sum of its proper divisors (1).

641940727 is an equidigital number, since it uses as much as digits as its factorization.

641940727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 641940727 is about 25336.5492322850. The cubic root of 641940727 is about 862.6440740068.

The spelling of 641940727 in words is "six hundred forty-one million, nine hundred forty thousand, seven hundred twenty-seven".