641239 has 2 divisors, whose sum is σ = 641240. Its totient is φ = 641238.

The previous prime is 641227. The next prime is 641261. The reversal of 641239 is 932146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641239 - 2⁹ = 640727 is a prime.

It is a super-2 number, since 2×641239² = 822374910242, which contains 22 as substring.

641239 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641279) by changing a digit.

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 as a sum of consecutive naturals, namely, 320619 + 320620.

It is an arithmetic number, because the mean of its divisors is an integer number (320620).

2⁶⁴¹²³⁹ is an apocalyptic number.

641239 is a deficient number, since it is larger than the sum of its proper divisors (1).

641239 is an equidigital number, since it uses as much as digits as its factorization.

641239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 641239 is about 800.7740005769. The cubic root of 641239 is about 86.2329630986.

The spelling of 641239 in words is "six hundred forty-one thousand, two hundred thirty-nine".