491810843399 has 2 divisors, whose sum is σ = 491810843400. Its totient is φ = 491810843398.

The previous prime is 491810843311. The next prime is 491810843479. The reversal of 491810843399 is 993348018194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491810843399 - 2³² = 487515876103 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491810843899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245905421699 + 245905421700.

It is an arithmetic number, because the mean of its divisors is an integer number (245905421700).

Almost surely, 2^491810843399 is an apocalyptic number.

491810843399 is a deficient number, since it is larger than the sum of its proper divisors (1).

491810843399 is an equidigital number, since it uses as much as digits as its factorization.

491810843399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 491810843399 in words is "four hundred ninety-one billion, eight hundred ten million, eight hundred forty-three thousand, three hundred ninety-nine".