641941 has 4 divisors (see below), whose sum is σ = 643552. Its totient is φ = 640332.

The previous prime is 641929. The next prime is 641959. The reversal of 641941 is 149146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 149146 = 2 ⋅74573.

It is a cyclic number.

It is not a de Polignac number, because 641941 - 2⁵ = 641909 is a prime.

It is a Duffinian number.

641941 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641981) 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 in 3 ways as a sum of consecutive naturals, for example, 286 + ... + 1168.

It is an arithmetic number, because the mean of its divisors is an integer number (160888).

2⁶⁴¹⁹⁴¹ is an apocalyptic number.

It is an amenable number.

641941 is a deficient number, since it is larger than the sum of its proper divisors (1611).

641941 is an equidigital number, since it uses as much as digits as its factorization.

641941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610.

The product of its digits is 864, while the sum is 25.

The square root of 641941 is about 801.2122065970. The cubic root of 641941 is about 86.2644196293.

The spelling of 641941 in words is "six hundred forty-one thousand, nine hundred forty-one".