649217603 has 2 divisors, whose sum is σ = 649217604. Its totient is φ = 649217602.

The previous prime is 649217599. The next prime is 649217633. The reversal of 649217603 is 306712946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649217603 - 2² = 649217599 is a prime.

It is not a weakly prime, because it can be changed into another prime (649217633) 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 as a sum of consecutive naturals, namely, 324608801 + 324608802.

It is an arithmetic number, because the mean of its divisors is an integer number (324608802).

Almost surely, 2^649217603 is an apocalyptic number.

649217603 is a deficient number, since it is larger than the sum of its proper divisors (1).

649217603 is an equidigital number, since it uses as much as digits as its factorization.

649217603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 649217603 is about 25479.7488802382. The cubic root of 649217603 is about 865.8914053463.

The spelling of 649217603 in words is "six hundred forty-nine million, two hundred seventeen thousand, six hundred three".