641693 has 6 divisors (see below), whose sum is σ = 695034. Its totient is φ = 592176.

The previous prime is 641681. The next prime is 641701. The reversal of 641693 is 396146.

It can be written as a sum of positive squares in 3 ways, for example, as 68644 + 573049 = 262^2 + 757^2 .

It is not a de Polignac number, because 641693 - 2⁸ = 641437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1730 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (115839).

2⁶⁴¹⁶⁹³ is an apocalyptic number.

It is an amenable number.

641693 is a deficient number, since it is larger than the sum of its proper divisors (53341).

641693 is a wasteful number, since it uses less digits than its factorization.

641693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3823 (or 3810 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 641693 is about 801.0574261562. The cubic root of 641693 is about 86.2533094018.

The spelling of 641693 in words is "six hundred forty-one thousand, six hundred ninety-three".