1919911769 has 2 divisors, whose sum is σ = 1919911770. Its totient is φ = 1919911768.

The previous prime is 1919911757. The next prime is 1919911771. The reversal of 1919911769 is 9671199191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1882518544 + 37393225 = 43388^2 + 6115^2 .

It is an emirp because it is prime and its reverse (9671199191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1919911769 - 2¹² = 1919907673 is a prime.

It is a super-2 number, since 2×1919911769² = 7372122401489418722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1919911771, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1919911769.

It is not a weakly prime, because it can be changed into another prime (1919911369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959955884 + 959955885.

It is an arithmetic number, because the mean of its divisors is an integer number (959955885).

Almost surely, 2^1919911769 is an apocalyptic number.

It is an amenable number.

1919911769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919911769 is an equidigital number, since it uses as much as digits as its factorization.

1919911769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 275562, while the sum is 53.

The square root of 1919911769 is about 43816.7977949097. The cubic root of 1919911769 is about 1242.8739636016.

The spelling of 1919911769 in words is "one billion, nine hundred nineteen million, nine hundred eleven thousand, seven hundred sixty-nine".