641105 has 4 divisors (see below), whose sum is σ = 769332. Its totient is φ = 512880.

The previous prime is 641101. The next prime is 641129. The reversal of 641105 is 501146.

It is a happy number.

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 271441 + 369664 = 521^2 + 608^2 .

It is not a de Polignac number, because 641105 - 2² = 641101 is a prime.

It is a super-2 number, since 2×641105² = 822031242050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64106 + ... + 64115.

It is an arithmetic number, because the mean of its divisors is an integer number (192333).

2⁶⁴¹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

641105 is a deficient number, since it is larger than the sum of its proper divisors (128227).

641105 is a wasteful number, since it uses less digits than its factorization.

641105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128226.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 641105 is about 800.6903271553. The cubic root of 641105 is about 86.2269559665.

The spelling of 641105 in words is "six hundred forty-one thousand, one hundred five".