641205 has 12 divisors (see below), whose sum is σ = 1111500. Its totient is φ = 341952.

The previous prime is 641203. The next prime is 641213. The reversal of 641205 is 502146.

It is a happy number.

641205 is a `hidden beast` number, since 641 + 20 + 5 = 666.

641205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 352836 + 288369 = 594^2 + 537^2 .

It is not a de Polignac number, because 641205 - 2¹ = 641203 is a prime.

It is a super-2 number, since 2×641205² = 822287704050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7080 + ... + 7169.

It is an arithmetic number, because the mean of its divisors is an integer number (92625).

2⁶⁴¹²⁰⁵ is an apocalyptic number.

It is an amenable number.

641205 is a deficient number, since it is larger than the sum of its proper divisors (470295).

641205 is a wasteful number, since it uses less digits than its factorization.

641205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14260 (or 14257 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 641205 is about 800.7527708350. The cubic root of 641205 is about 86.2314389801.

The spelling of 641205 in words is "six hundred forty-one thousand, two hundred five".