641500 has 24 divisors (see below), whose sum is σ = 1402128. Its totient is φ = 256400.

The previous prime is 641491. The next prime is 641513. The reversal of 641500 is 5146.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

641500 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 142 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (58422).

2⁶⁴¹⁵⁰⁰ is an apocalyptic number.

It is an amenable number.

641500 is an abundant number, since it is smaller than the sum of its proper divisors (760628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641500 is a wasteful number, since it uses less digits than its factorization.

641500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 641500 is about 800.9369513264. The cubic root of 641500 is about 86.2446611552.

Adding to 641500 its reverse (5146), we get a palindrome (646646).

The spelling of 641500 in words is "six hundred forty-one thousand, five hundred".