641305 has 16 divisors (see below), whose sum is σ = 895104. Its totient is φ = 432000.

The previous prime is 641299. The next prime is 641317. The reversal of 641305 is 503146.

It is not a de Polignac number, because 641305 - 2⁹ = 640793 is a prime.

It is a super-2 number, since 2×641305² = 822544206050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2430 + ... + 2680.

It is an arithmetic number, because the mean of its divisors is an integer number (55944).

2⁶⁴¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

641305 is a deficient number, since it is larger than the sum of its proper divisors (253799).

641305 is a wasteful number, since it uses less digits than its factorization.

641305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 641305 is about 800.8152096458. The cubic root of 641305 is about 86.2359215276.

It can be divided in two parts, 641 and 305, that added together give a triangular number (946 = T₄₃).

The spelling of 641305 in words is "six hundred forty-one thousand, three hundred five".