649385513 has 4 divisors (see below), whose sum is σ = 742154880. Its totient is φ = 556616148.

The previous prime is 649385497. The next prime is 649385579. The reversal of 649385513 is 315583946.

649385513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 649385513 - 2⁴ = 649385497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649385413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46384673 + ... + 46384686.

It is an arithmetic number, because the mean of its divisors is an integer number (185538720).

Almost surely, 2^649385513 is an apocalyptic number.

It is an amenable number.

649385513 is a deficient number, since it is larger than the sum of its proper divisors (92769367).

649385513 is an equidigital number, since it uses as much as digits as its factorization.

649385513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92769366.

The product of its digits is 388800, while the sum is 44.

The square root of 649385513 is about 25483.0436368971. The cubic root of 649385513 is about 865.9660486772.

The spelling of 649385513 in words is "six hundred forty-nine million, three hundred eighty-five thousand, five hundred thirteen".