641801 has 8 divisors (see below), whose sum is σ = 715680. Its totient is φ = 571968.

The previous prime is 641791. The next prime is 641803. The reversal of 641801 is 108146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641801 - 2¹⁰ = 640777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641801.

It is not an unprimeable number, because it can be changed into a prime (641803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671 + ... + 1316.

It is an arithmetic number, because the mean of its divisors is an integer number (89460).

2⁶⁴¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

641801 is a deficient number, since it is larger than the sum of its proper divisors (73879).

641801 is a wasteful number, since it uses less digits than its factorization.

641801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 641801 is about 801.1248342175. The cubic root of 641801 is about 86.2581480785.

Adding to 641801 its reverse (108146), we get a palindrome (749947).

The spelling of 641801 in words is "six hundred forty-one thousand, eight hundred one".