649449619 has 16 divisors (see below), whose sum is σ = 816334848. Its totient is φ = 502913952.

The previous prime is 649449617. The next prime is 649449649. The reversal of 649449619 is 916944946.

649449619 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 649449619 - 2¹ = 649449617 is a prime.

It is a super-2 number, since 2×649449619² = 843569615238490322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649449617) 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, 71647 + ... + 80200.

It is an arithmetic number, because the mean of its divisors is an integer number (51020928).

Almost surely, 2^649449619 is an apocalyptic number.

649449619 is a deficient number, since it is larger than the sum of its proper divisors (166885229).

649449619 is a wasteful number, since it uses less digits than its factorization.

649449619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151914.

The product of its digits is 1679616, while the sum is 52.

The square root of 649449619 is about 25484.3014226406. The cubic root of 649449619 is about 865.9945432010.

The spelling of 649449619 in words is "six hundred forty-nine million, four hundred forty-nine thousand, six hundred nineteen".