1649383609 has 2 divisors, whose sum is σ = 1649383610. Its totient is φ = 1649383608.

The previous prime is 1649383607. The next prime is 1649383627. The reversal of 1649383609 is 9063839461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1208257600 + 441126009 = 34760^2 + 21003^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649383609 - 2¹ = 1649383607 is a prime.

Together with 1649383607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1649383607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824691804 + 824691805.

It is an arithmetic number, because the mean of its divisors is an integer number (824691805).

Almost surely, 2^1649383609 is an apocalyptic number.

It is an amenable number.

1649383609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649383609 is an equidigital number, since it uses as much as digits as its factorization.

1649383609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 1649383609 is about 40612.6040657331. The cubic root of 1649383609 is about 1181.5185870632.

The spelling of 1649383609 in words is "one billion, six hundred forty-nine million, three hundred eighty-three thousand, six hundred nine".