641585 has 16 divisors (see below), whose sum is σ = 919296. Its totient is φ = 420288.

The previous prime is 641581. The next prime is 641623. The reversal of 641585 is 585146.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 641585 - 2² = 641581 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641585.

It is not an unprimeable number, because it can be changed into a prime (641581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407 + ... + 1203.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2⁶⁴¹⁵⁸⁵ is an apocalyptic number.

It is an amenable number.

641585 is a deficient number, since it is larger than the sum of its proper divisors (277711).

641585 is a wasteful number, since it uses less digits than its factorization.

641585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832.

The product of its digits is 4800, while the sum is 29.

The square root of 641585 is about 800.9900124221. The cubic root of 641585 is about 86.2484701822.

The spelling of 641585 in words is "six hundred forty-one thousand, five hundred eighty-five".