659641 has 4 divisors (see below), whose sum is σ = 661284. Its totient is φ = 658000.

The previous prime is 659639. The next prime is 659653. The reversal of 659641 is 146956.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 495616 + 164025 = 704^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 659641 - 2¹ = 659639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659611) 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, 231 + ... + 1171.

It is an arithmetic number, because the mean of its divisors is an integer number (165321).

2⁶⁵⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

659641 is a deficient number, since it is larger than the sum of its proper divisors (1643).

659641 is an equidigital number, since it uses as much as digits as its factorization.

659641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642.

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

The square root of 659641 is about 812.1828611834. The cubic root of 659641 is about 87.0500878619.

The spelling of 659641 in words is "six hundred fifty-nine thousand, six hundred forty-one".