649289539 has 2 divisors, whose sum is σ = 649289540. Its totient is φ = 649289538.

The previous prime is 649289507. The next prime is 649289567. The reversal of 649289539 is 935982946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649289539 - 2⁵ = 649289507 is a prime.

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 649289539.

It is not a weakly prime, because it can be changed into another prime (649389539) by changing a digit.

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, 324644769 + 324644770.

It is an arithmetic number, because the mean of its divisors is an integer number (324644770).

Almost surely, 2^649289539 is an apocalyptic number.

649289539 is a deficient number, since it is larger than the sum of its proper divisors (1).

649289539 is an equidigital number, since it uses as much as digits as its factorization.

649289539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 55.

The square root of 649289539 is about 25481.1604720036. The cubic root of 649289539 is about 865.9233856168.

The spelling of 649289539 in words is "six hundred forty-nine million, two hundred eighty-nine thousand, five hundred thirty-nine".