1916799149 has 2 divisors, whose sum is σ = 1916799150. Its totient is φ = 1916799148.

The previous prime is 1916799133. The next prime is 1916799151. The reversal of 1916799149 is 9419976191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1581652900 + 335146249 = 39770^2 + 18307^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916799149 - 2⁴ = 1916799133 is a prime.

It is a Sophie Germain prime.

Together with 1916799151, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1916799094 and 1916799103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1916799119) 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, 958399574 + 958399575.

It is an arithmetic number, because the mean of its divisors is an integer number (958399575).

Almost surely, 2^1916799149 is an apocalyptic number.

It is an amenable number.

1916799149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916799149 is an equidigital number, since it uses as much as digits as its factorization.

1916799149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 56.

The square root of 1916799149 is about 43781.2648172709. The cubic root of 1916799149 is about 1242.2019384714.

The spelling of 1916799149 in words is "one billion, nine hundred sixteen million, seven hundred ninety-nine thousand, one hundred forty-nine".