641601 has 15 divisors (see below), whose sum is σ = 969331. Its totient is φ = 422928.

The previous prime is 641581. The next prime is 641623. The reversal of 641601 is 106146.

The square root of 641601 is 801.

It is a perfect power (a square), and thus also a powerful number.

641601 is a `hidden beast` number, since 64 + 1 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 123201 + 518400 = 351^2 + 720^2 .

It is not a de Polignac number, because 641601 - 2⁹ = 641089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641681) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7165 + ... + 7253.

2⁶⁴¹⁶⁰¹ is an apocalyptic number.

641601 is the 801-st square number.

641601 is the 401-st centered octagonal number.

It is an amenable number.

641601 is a deficient number, since it is larger than the sum of its proper divisors (327730).

641601 is an frugal number, since it uses more digits than its factorization.

641601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The cubic root of 641601 is about 86.2491871379.

Multiplying 641601 by its product of nonzero digits (144), we get a square (92390544 = 9612²).

Adding to 641601 its reverse (106146), we get a palindrome (747747).

The spelling of 641601 in words is "six hundred forty-one thousand, six hundred one".