1644449683 has 2 divisors, whose sum is σ = 1644449684. Its totient is φ = 1644449682.

The previous prime is 1644449671. The next prime is 1644449713. The reversal of 1644449683 is 3869444461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1644449683 is a prime.

It is not a weakly prime, because it can be changed into another prime (1644449623) 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 as a sum of consecutive naturals, namely, 822224841 + 822224842.

It is an arithmetic number, because the mean of its divisors is an integer number (822224842).

Almost surely, 2^1644449683 is an apocalyptic number.

1644449683 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644449683 is an equidigital number, since it uses as much as digits as its factorization.

1644449683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1990656, while the sum is 49.

The square root of 1644449683 is about 40551.8147929288. The cubic root of 1644449683 is about 1180.3392883865.

The spelling of 1644449683 in words is "one billion, six hundred forty-four million, four hundred forty-nine thousand, six hundred eighty-three".