641541 has 4 divisors (see below), whose sum is σ = 855392. Its totient is φ = 427692.

The previous prime is 641521. The next prime is 641549. The reversal of 641541 is 145146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 641541 - 2⁷ = 641413 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641549) 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, 106921 + ... + 106926.

It is an arithmetic number, because the mean of its divisors is an integer number (213848).

2⁶⁴¹⁵⁴¹ is an apocalyptic number.

It is an amenable number.

641541 is a deficient number, since it is larger than the sum of its proper divisors (213851).

641541 is a wasteful number, since it uses less digits than its factorization.

641541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213850.

The product of its digits is 480, while the sum is 21.

The square root of 641541 is about 800.9625459408. The cubic root of 641541 is about 86.2464984926.

Adding to 641541 its reverse (145146), we get a palindrome (786687).

The spelling of 641541 in words is "six hundred forty-one thousand, five hundred forty-one".