643241 has 4 divisors (see below), whose sum is σ = 671232. Its totient is φ = 615252.

The previous prime is 643231. The next prime is 643243. The reversal of 643241 is 142346.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 643241 - 2¹⁰ = 642217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643243) 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, 13961 + ... + 14006.

It is an arithmetic number, because the mean of its divisors is an integer number (167808).

2⁶⁴³²⁴¹ is an apocalyptic number.

It is an amenable number.

643241 is a deficient number, since it is larger than the sum of its proper divisors (27991).

643241 is a wasteful number, since it uses less digits than its factorization.

643241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27990.

The product of its digits is 576, while the sum is 20.

The square root of 643241 is about 802.0230669999. The cubic root of 643241 is about 86.3226119603.

Adding to 643241 its reverse (142346), we get a palindrome (785587).

The spelling of 643241 in words is "six hundred forty-three thousand, two hundred forty-one".