649639803 has 4 divisors (see below), whose sum is σ = 866186408. Its totient is φ = 433093200.

The previous prime is 649639787. The next prime is 649639871. The reversal of 649639803 is 308936946.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 649639803 - 2⁴ = 649639787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649639883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108273298 + ... + 108273303.

It is an arithmetic number, because the mean of its divisors is an integer number (216546602).

Almost surely, 2^649639803 is an apocalyptic number.

649639803 is a deficient number, since it is larger than the sum of its proper divisors (216546605).

649639803 is a wasteful number, since it uses less digits than its factorization.

649639803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216546604.

The product of its (nonzero) digits is 839808, while the sum is 48.

The square root of 649639803 is about 25488.0325447062. The cubic root of 649639803 is about 866.0790671976.

The spelling of 649639803 in words is "six hundred forty-nine million, six hundred thirty-nine thousand, eight hundred three".