649959 has 4 divisors (see below), whose sum is σ = 866616. Its totient is φ = 433304.

The previous prime is 649937. The next prime is 649969. The reversal of 649959 is 959946.

It is a happy number.

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 649959 - 2¹⁵ = 617191 is a prime.

It is a super-3 number, since 3×649959³ = 823719107333643237, which contains 333 as substring.

It is a D-number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 649959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108324 + ... + 108329.

It is an arithmetic number, because the mean of its divisors is an integer number (216654).

2⁶⁴⁹⁹⁵⁹ is an apocalyptic number.

649959 is a deficient number, since it is larger than the sum of its proper divisors (216657).

649959 is a wasteful number, since it uses less digits than its factorization.

649959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216656.

The product of its digits is 87480, while the sum is 42.

The square root of 649959 is about 806.2003473083. The cubic root of 649959 is about 86.6220891725.

The spelling of 649959 in words is "six hundred forty-nine thousand, nine hundred fifty-nine".