649648109 has 32 divisors (see below), whose sum is σ = 749094912. Its totient is φ = 558144000.

The previous prime is 649648093. The next prime is 649648163. The reversal of 649648109 is 901846946.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 649648109 - 2⁴ = 649648093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649648199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3401204 + ... + 3401394.

It is an arithmetic number, because the mean of its divisors is an integer number (23409216).

Almost surely, 2^649648109 is an apocalyptic number.

It is an amenable number.

649648109 is a deficient number, since it is larger than the sum of its proper divisors (99446803).

649648109 is a wasteful number, since it uses less digits than its factorization.

649648109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 649648109 is about 25488.1954833998. The cubic root of 649648109 is about 866.0827582800.

The spelling of 649648109 in words is "six hundred forty-nine million, six hundred forty-eight thousand, one hundred nine".