1639449113 has 2 divisors, whose sum is σ = 1639449114. Its totient is φ = 1639449112.

The previous prime is 1639449109. The next prime is 1639449121. The reversal of 1639449113 is 3119449361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1464363289 + 175085824 = 38267^2 + 13232^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639449113 - 2² = 1639449109 is a prime.

It is not a weakly prime, because it can be changed into another prime (1639449103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819724556 + 819724557.

It is an arithmetic number, because the mean of its divisors is an integer number (819724557).

Almost surely, 2^1639449113 is an apocalyptic number.

It is an amenable number.

1639449113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1639449113 is an equidigital number, since it uses as much as digits as its factorization.

1639449113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 1639449113 is about 40490.1112989332. Note that the first 3 decimals coincide. The cubic root of 1639449113 is about 1179.1416512240.

The spelling of 1639449113 in words is "one billion, six hundred thirty-nine million, four hundred forty-nine thousand, one hundred thirteen".