649131206 has 4 divisors (see below), whose sum is σ = 973696812. Its totient is φ = 324565602.

The previous prime is 649131193. The next prime is 649131209. The reversal of 649131206 is 602131946.

649131206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649131209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162282800 + ... + 162282803.

It is an arithmetic number, because the mean of its divisors is an integer number (243424203).

Almost surely, 2^649131206 is an apocalyptic number.

649131206 is a deficient number, since it is larger than the sum of its proper divisors (324565606).

649131206 is a wasteful number, since it uses less digits than its factorization.

649131206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324565605.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 649131206 is about 25478.0534185797. The cubic root of 649131206 is about 865.8529930901.

The spelling of 649131206 in words is "six hundred forty-nine million, one hundred thirty-one thousand, two hundred six".