649309859 has 4 divisors (see below), whose sum is σ = 708338040. Its totient is φ = 590281680.

The previous prime is 649309831. The next prime is 649309877. The reversal of 649309859 is 958903946.

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 649309859 - 2²⁴ = 632532643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649309859.

It is not an unprimeable number, because it can be changed into a prime (649209859) 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 3 ways as a sum of consecutive naturals, for example, 29514074 + ... + 29514095.

It is an arithmetic number, because the mean of its divisors is an integer number (177084510).

Almost surely, 2^649309859 is an apocalyptic number.

649309859 is a deficient number, since it is larger than the sum of its proper divisors (59028181).

649309859 is a wasteful number, since it uses less digits than its factorization.

649309859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59028180.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 649309859 is about 25481.5591948374. The cubic root of 649309859 is about 865.9324187618.

The spelling of 649309859 in words is "six hundred forty-nine million, three hundred nine thousand, eight hundred fifty-nine".