1843913915491 has 2 divisors, whose sum is σ = 1843913915492. Its totient is φ = 1843913915490.

The previous prime is 1843913915489. The next prime is 1843913915507. The reversal of 1843913915491 is 1945193193481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1843913915491 - 2¹ = 1843913915489 is a prime.

Together with 1843913915489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1843913915401) 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, 921956957745 + 921956957746.

It is an arithmetic number, because the mean of its divisors is an integer number (921956957746).

Almost surely, 2^{1843913915491} is an apocalyptic number.

1843913915491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843913915491 is an equidigital number, since it uses as much as digits as its factorization.

1843913915491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4199040, while the sum is 58.

The spelling of 1843913915491 in words is "one trillion, eight hundred forty-three billion, nine hundred thirteen million, nine hundred fifteen thousand, four hundred ninety-one".