1843913910491 has 2 divisors, whose sum is σ = 1843913910492. Its totient is φ = 1843913910490.

The previous prime is 1843913910413. The next prime is 1843913910539. The reversal of 1843913910491 is 1940193193481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1843913910491 is a prime.

It is a super-2 number, since 2×1843913910491² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1843913915491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921956955245 + 921956955246.

It is an arithmetic number, because the mean of its divisors is an integer number (921956955246).

Almost surely, 2^{1843913910491} is an apocalyptic number.

1843913910491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843913910491 is an equidigital number, since it uses as much as digits as its factorization.

1843913910491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 53.

The spelling of 1843913910491 in words is "one trillion, eight hundred forty-three billion, nine hundred thirteen million, nine hundred ten thousand, four hundred ninety-one".