649111 has 4 divisors (see below), whose sum is σ = 687312. Its totient is φ = 610912.

The previous prime is 649093. The next prime is 649123. The reversal of 649111 is 111946.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 649111 - 2⁵ = 649079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649141) 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, 19075 + ... + 19108.

It is an arithmetic number, because the mean of its divisors is an integer number (171828).

2⁶⁴⁹¹¹¹ is an apocalyptic number.

649111 is a deficient number, since it is larger than the sum of its proper divisors (38201).

649111 is a wasteful number, since it uses less digits than its factorization.

649111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38200.

The product of its digits is 216, while the sum is 22.

The square root of 649111 is about 805.6742517916. The cubic root of 649111 is about 86.5844008976.

The spelling of 649111 in words is "six hundred forty-nine thousand, one hundred eleven".