649982209 has 16 divisors (see below), whose sum is σ = 674472960. Its totient is φ = 626083920.

The previous prime is 649982197. The next prime is 649982227. The reversal of 649982209 is 902289946.

It is a happy number.

649982209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 649982209 - 2²¹ = 647885057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649982269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 660732 + ... + 661714.

It is an arithmetic number, because the mean of its divisors is an integer number (42154560).

Almost surely, 2^649982209 is an apocalyptic number.

It is an amenable number.

649982209 is a deficient number, since it is larger than the sum of its proper divisors (24490751).

649982209 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (649982208) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (1260).

649982209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 649982209 is about 25494.7486553604. The cubic root of 649982209 is about 866.2312020586.

The spelling of 649982209 in words is "six hundred forty-nine million, nine hundred eighty-two thousand, two hundred nine".