641289 has 8 divisors (see below), whose sum is σ = 932832. Its totient is φ = 388640.

The previous prime is 641287. The next prime is 641299. The reversal of 641289 is 982146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641289 - 2¹ = 641287 is a prime.

It is a super-2 number, since 2×641289² = 822503163042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9684 + ... + 9749.

It is an arithmetic number, because the mean of its divisors is an integer number (116604).

2⁶⁴¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

641289 is a deficient number, since it is larger than the sum of its proper divisors (291543).

641289 is a wasteful number, since it uses less digits than its factorization.

641289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19447.

The product of its digits is 3456, while the sum is 30.

The square root of 641289 is about 800.8052197632. The cubic root of 641289 is about 86.2352043514.

The spelling of 641289 in words is "six hundred forty-one thousand, two hundred eighty-nine".