641682539 has 2 divisors, whose sum is σ = 641682540. Its totient is φ = 641682538.

The previous prime is 641682523. The next prime is 641682541. The reversal of 641682539 is 935286146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641682539 - 2⁴ = 641682523 is a prime.

It is a Sophie Germain prime.

Together with 641682541, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641682539.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320841269 + 320841270.

It is an arithmetic number, because the mean of its divisors is an integer number (320841270).

Almost surely, 2^641682539 is an apocalyptic number.

641682539 is a deficient number, since it is larger than the sum of its proper divisors (1).

641682539 is an equidigital number, since it uses as much as digits as its factorization.

641682539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 44.

The square root of 641682539 is about 25331.4535508723. The cubic root of 641682539 is about 862.5284069339.

The spelling of 641682539 in words is "six hundred forty-one million, six hundred eighty-two thousand, five hundred thirty-nine".