649871603 has 4 divisors (see below), whose sum is σ = 649983408. Its totient is φ = 649759800.

The previous prime is 649871587. The next prime is 649871609. The reversal of 649871603 is 306178946.

649871603 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.

It is a cyclic number.

It is not a de Polignac number, because 649871603 - 2⁴ = 649871587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649871609) 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, 46676 + ... + 58977.

It is an arithmetic number, because the mean of its divisors is an integer number (162495852).

Almost surely, 2^649871603 is an apocalyptic number.

649871603 is a deficient number, since it is larger than the sum of its proper divisors (111805).

649871603 is a wasteful number, since it uses less digits than its factorization.

649871603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111804.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 649871603 is about 25492.5793712602. The cubic root of 649871603 is about 866.1820644042.

The spelling of 649871603 in words is "six hundred forty-nine million, eight hundred seventy-one thousand, six hundred three".