641365 has 4 divisors (see below), whose sum is σ = 769644. Its totient is φ = 513088.

The previous prime is 641327. The next prime is 641371. The reversal of 641365 is 563146.

641365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96721 + 544644 = 311^2 + 738^2 .

It is a cyclic number.

It is not a de Polignac number, because 641365 - 2⁹ = 640853 is a prime.

It is a super-2 number, since 2×641365² = 822698126450, which contains 22 as substring.

It is a Duffinian number.

641365 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64132 + ... + 64141.

It is an arithmetic number, because the mean of its divisors is an integer number (192411).

2⁶⁴¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

641365 is a deficient number, since it is larger than the sum of its proper divisors (128279).

641365 is a wasteful number, since it uses less digits than its factorization.

641365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128278.

The product of its digits is 2160, while the sum is 25.

The square root of 641365 is about 800.8526705955. The cubic root of 641365 is about 86.2386108325.

The spelling of 641365 in words is "six hundred forty-one thousand, three hundred sixty-five".