649505589 has 8 divisors (see below), whose sum is σ = 869301312. Its totient is φ = 431356800.

The previous prime is 649505561. The next prime is 649505599. The reversal of 649505589 is 985505946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649505589 - 2²⁴ = 632728373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649505509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410812 + ... + 412389.

It is an arithmetic number, because the mean of its divisors is an integer number (108662664).

Almost surely, 2^649505589 is an apocalyptic number.

It is an amenable number.

649505589 is a deficient number, since it is larger than the sum of its proper divisors (219795723).

649505589 is a wasteful number, since it uses less digits than its factorization.

649505589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823467.

The product of its (nonzero) digits is 1944000, while the sum is 51.

The square root of 649505589 is about 25485.3995260031. The cubic root of 649505589 is about 866.0194198149.

The spelling of 649505589 in words is "six hundred forty-nine million, five hundred five thousand, five hundred eighty-nine".