1919849112491 has 2 divisors, whose sum is σ = 1919849112492. Its totient is φ = 1919849112490.

The previous prime is 1919849112463. The next prime is 1919849112607. The reversal of 1919849112491 is 1942119489191.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1919849112491 is a prime.

It is a super-2 number, since 2×1919849112491² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1919849112491.

It is not a weakly prime, because it can be changed into another prime (1919849112091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959924556245 + 959924556246.

It is an arithmetic number, because the mean of its divisors is an integer number (959924556246).

Almost surely, 2^{1919849112491} is an apocalyptic number.

1919849112491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919849112491 is an equidigital number, since it uses as much as digits as its factorization.

1919849112491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 59.

The spelling of 1919849112491 in words is "one trillion, nine hundred nineteen billion, eight hundred forty-nine million, one hundred twelve thousand, four hundred ninety-one".