649743449 has 4 divisors (see below), whose sum is σ = 651584436. Its totient is φ = 647902464.

The previous prime is 649743443. The next prime is 649743503. The reversal of 649743449 is 944347946.

It is a happy number.

649743449 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 can be written as a sum of positive squares in 2 ways, for example, as 188567824 + 461175625 = 13732^2 + 21475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649743449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 649743397 and 649743406.

It is not an unprimeable number, because it can be changed into a prime (649743443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919964 + ... + 920669.

It is an arithmetic number, because the mean of its divisors is an integer number (162896109).

Almost surely, 2^649743449 is an apocalyptic number.

It is an amenable number.

649743449 is a deficient number, since it is larger than the sum of its proper divisors (1840987).

649743449 is a wasteful number, since it uses less digits than its factorization.

649743449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840986.

The product of its digits is 2612736, while the sum is 50.

The square root of 649743449 is about 25490.0656923438. The cubic root of 649743449 is about 866.1251239289.

The spelling of 649743449 in words is "six hundred forty-nine million, seven hundred forty-three thousand, four hundred forty-nine".