1916648809 has 2 divisors, whose sum is σ = 1916648810. Its totient is φ = 1916648808.

The previous prime is 1916648737. The next prime is 1916648819. The reversal of 1916648809 is 9088466191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1077677584 + 838971225 = 32828^2 + 28965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916648809 - 2⁷ = 1916648681 is a prime.

It is a super-2 number, since 2×1916648809² = 7347085314082236962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1916648819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 958324404 + 958324405.

It is an arithmetic number, because the mean of its divisors is an integer number (958324405).

Almost surely, 2^1916648809 is an apocalyptic number.

It is an amenable number.

1916648809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916648809 is an equidigital number, since it uses as much as digits as its factorization.

1916648809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 1916648809 is about 43779.5478391452. The cubic root of 1916648809 is about 1242.1694611472.

The spelling of 1916648809 in words is "one billion, nine hundred sixteen million, six hundred forty-eight thousand, eight hundred nine".