641185 has 4 divisors (see below), whose sum is σ = 769428. Its totient is φ = 512944.

The previous prime is 641167. The next prime is 641197. The reversal of 641185 is 581146.

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 166464 + 474721 = 408^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 641185 - 2⁷ = 641057 is a prime.

It is a super-2 number, since 2×641185² = 822236408450, which contains 22 as substring.

It is a Duffinian number.

641185 is a lucky 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, 64114 + ... + 64123.

It is an arithmetic number, because the mean of its divisors is an integer number (192357).

2⁶⁴¹¹⁸⁵ is an apocalyptic number.

It is an amenable number.

641185 is a deficient number, since it is larger than the sum of its proper divisors (128243).

641185 is a wasteful number, since it uses less digits than its factorization.

641185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128242.

The product of its digits is 960, while the sum is 25.

The square root of 641185 is about 800.7402824886. The cubic root of 641185 is about 86.2305424147.

The spelling of 641185 in words is "six hundred forty-one thousand, one hundred eighty-five".