649560919 has 4 divisors (see below), whose sum is σ = 742355344. Its totient is φ = 556766496.

The previous prime is 649560869. The next prime is 649560929. The reversal of 649560919 is 919065946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919065946 = 2 ⋅459532973.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649560919 is a prime.

It is a super-2 number, since 2×649560919² = 843858774984249122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649560929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46397202 + ... + 46397215.

It is an arithmetic number, because the mean of its divisors is an integer number (185588836).

Almost surely, 2^649560919 is an apocalyptic number.

649560919 is a deficient number, since it is larger than the sum of its proper divisors (92794425).

649560919 is an equidigital number, since it uses as much as digits as its factorization.

649560919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92794424.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 649560919 is about 25486.4850263821. The cubic root of 649560919 is about 866.0440105676.

The spelling of 649560919 in words is "six hundred forty-nine million, five hundred sixty thousand, nine hundred nineteen".