649889803 has 2 divisors, whose sum is σ = 649889804. Its totient is φ = 649889802.

The previous prime is 649889789. The next prime is 649889833. The reversal of 649889803 is 308988946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649889803 - 2¹⁷ = 649758731 is a prime.

It is not a weakly prime, because it can be changed into another prime (649889833) 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, 324944901 + 324944902.

It is an arithmetic number, because the mean of its divisors is an integer number (324944902).

Almost surely, 2^649889803 is an apocalyptic number.

649889803 is a deficient number, since it is larger than the sum of its proper divisors (1).

649889803 is an equidigital number, since it uses as much as digits as its factorization.

649889803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 649889803 is about 25492.9363353851. The cubic root of 649889803 is about 866.1901502919.

The spelling of 649889803 in words is "six hundred forty-nine million, eight hundred eighty-nine thousand, eight hundred three".