641791 has 2 divisors, whose sum is σ = 641792. Its totient is φ = 641790.

The previous prime is 641789. The next prime is 641803. The reversal of 641791 is 197146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641791 - 2¹ = 641789 is a prime.

Together with 641789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320895 + 320896.

It is an arithmetic number, because the mean of its divisors is an integer number (320896).

2⁶⁴¹⁷⁹¹ is an apocalyptic number.

641791 is a deficient number, since it is larger than the sum of its proper divisors (1).

641791 is an equidigital number, since it uses as much as digits as its factorization.

641791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 641791 is about 801.1185929686. The cubic root of 641791 is about 86.2577000757.

The spelling of 641791 in words is "six hundred forty-one thousand, seven hundred ninety-one".