649911 has 8 divisors (see below), whose sum is σ = 904320. Its totient is φ = 414392.

The previous prime is 649907. The next prime is 649921. The reversal of 649911 is 119946.

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

It is a cyclic number.

It is not a de Polignac number, because 649911 - 2² = 649907 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649921) 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 7 ways as a sum of consecutive naturals, for example, 4641 + ... + 4778.

It is an arithmetic number, because the mean of its divisors is an integer number (113040).

2⁶⁴⁹⁹¹¹ is an apocalyptic number.

649911 is a deficient number, since it is larger than the sum of its proper divisors (254409).

649911 is a wasteful number, since it uses less digits than its factorization.

649911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9445.

The product of its digits is 1944, while the sum is 30.

The square root of 649911 is about 806.1705774835. The cubic root of 649911 is about 86.6199567495.

The spelling of 649911 in words is "six hundred forty-nine thousand, nine hundred eleven".