649228309 has 4 divisors (see below), whose sum is σ = 683398240. Its totient is φ = 615058380.

The previous prime is 649228289. The next prime is 649228339. The reversal of 649228309 is 903822946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649228309 - 2⁵ = 649228277 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 (649228339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17084937 + ... + 17084974.

It is an arithmetic number, because the mean of its divisors is an integer number (170849560).

Almost surely, 2^649228309 is an apocalyptic number.

It is an amenable number.

649228309 is a deficient number, since it is larger than the sum of its proper divisors (34169931).

649228309 is a wasteful number, since it uses less digits than its factorization.

649228309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34169930.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 649228309 is about 25479.9589677849. The cubic root of 649228309 is about 865.8961650151.

The spelling of 649228309 in words is "six hundred forty-nine million, two hundred twenty-eight thousand, three hundred nine".