641503 has 4 divisors (see below), whose sum is σ = 655200. Its totient is φ = 627808.

The previous prime is 641491. The next prime is 641513. The reversal of 641503 is 305146.

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 641503 - 2⁵ = 641471 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6778 + ... + 6871.

It is an arithmetic number, because the mean of its divisors is an integer number (163800).

2⁶⁴¹⁵⁰³ is an apocalyptic number.

641503 is a deficient number, since it is larger than the sum of its proper divisors (13697).

641503 is a wasteful number, since it uses less digits than its factorization.

641503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13696.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 641503 is about 800.9388241308. The cubic root of 641503 is about 86.2447955972.

Adding to 641503 its reverse (305146), we get a palindrome (946649).

The spelling of 641503 in words is "six hundred forty-one thousand, five hundred three".