641550 has 96 divisors (see below), whose sum is σ = 1999872. Its totient is φ = 132480.

The previous prime is 641549. The next prime is 641551. The reversal of 641550 is 55146.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (641549) and next prime (641551).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13627 + ... + 13673.

It is an arithmetic number, because the mean of its divisors is an integer number (20832).

2⁶⁴¹⁵⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999936).

641550 is an abundant number, since it is smaller than the sum of its proper divisors (1358322).

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

641550 is a wasteful number, since it uses less digits than its factorization.

641550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 641550 is about 800.9681641613. The cubic root of 641550 is about 86.2469018001.

Adding to 641550 its reverse (55146), we get a palindrome (696696).

The spelling of 641550 in words is "six hundred forty-one thousand, five hundred fifty".