649678111 has 4 divisors (see below), whose sum is σ = 649798000. Its totient is φ = 649558224.

The previous prime is 649678093. The next prime is 649678147. The reversal of 649678111 is 111876946.

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 649678111 - 2²¹ = 647580959 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 (649678151) 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, 51411 + ... + 62788.

It is an arithmetic number, because the mean of its divisors is an integer number (162449500).

Almost surely, 2^649678111 is an apocalyptic number.

649678111 is a deficient number, since it is larger than the sum of its proper divisors (119889).

649678111 is a wasteful number, since it uses less digits than its factorization.

649678111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119888.

The product of its digits is 72576, while the sum is 43.

The square root of 649678111 is about 25488.7840235661. The cubic root of 649678111 is about 866.0960905310.

The spelling of 649678111 in words is "six hundred forty-nine million, six hundred seventy-eight thousand, one hundred eleven".