641747 has 2 divisors, whose sum is σ = 641748. Its totient is φ = 641746.

The previous prime is 641713. The next prime is 641749. The reversal of 641747 is 747146.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641747 - 2⁸ = 641491 is a prime.

Together with 641749, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (641749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320873 + 320874.

It is an arithmetic number, because the mean of its divisors is an integer number (320874).

2⁶⁴¹⁷⁴⁷ is an apocalyptic number.

641747 is a deficient number, since it is larger than the sum of its proper divisors (1).

641747 is an equidigital number, since it uses as much as digits as its factorization.

641747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 641747 is about 801.0911308959. The cubic root of 641747 is about 86.2557288080.

The spelling of 641747 in words is "six hundred forty-one thousand, seven hundred forty-seven".