649883521 has 12 divisors (see below), whose sum is σ = 759330288. Its totient is φ = 554579592.

The previous prime is 649883513. The next prime is 649883539. The reversal of 649883521 is 125388946.

It is not a de Polignac number, because 649883521 - 2³ = 649883513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649883501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18091 + ... + 40336.

It is an arithmetic number, because the mean of its divisors is an integer number (63277524).

Almost surely, 2^649883521 is an apocalyptic number.

It is an amenable number.

649883521 is a deficient number, since it is larger than the sum of its proper divisors (109446767).

649883521 is a wasteful number, since it uses less digits than its factorization.

649883521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58668 (or 58661 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 649883521 is about 25492.8131244867. The cubic root of 649883521 is about 866.1873593448.

The spelling of 649883521 in words is "six hundred forty-nine million, eight hundred eighty-three thousand, five hundred twenty-one".