641695 has 4 divisors (see below), whose sum is σ = 770040. Its totient is φ = 513352.

The previous prime is 641681. The next prime is 641701. The reversal of 641695 is 596146.

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

It is a cyclic number.

It is not a de Polignac number, because 641695 - 2¹¹ = 639647 is a prime.

It is a super-3 number, since 3×641695³ = 792697011233332125, which contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 64165 + ... + 64174.

It is an arithmetic number, because the mean of its divisors is an integer number (192510).

2⁶⁴¹⁶⁹⁵ is an apocalyptic number.

641695 is a deficient number, since it is larger than the sum of its proper divisors (128345).

641695 is a wasteful number, since it uses less digits than its factorization.

641695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128344.

The product of its digits is 6480, while the sum is 31.

The square root of 641695 is about 801.0586745052. The cubic root of 641695 is about 86.2533990119.

The spelling of 641695 in words is "six hundred forty-one thousand, six hundred ninety-five".