491741658671 has 2 divisors, whose sum is σ = 491741658672. Its totient is φ = 491741658670.

The previous prime is 491741658649. The next prime is 491741658719. The reversal of 491741658671 is 176856147194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491741658671 - 2²² = 491737464367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491741658671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491741658601) 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, 245870829335 + 245870829336.

It is an arithmetic number, because the mean of its divisors is an integer number (245870829336).

Almost surely, 2^491741658671 is an apocalyptic number.

491741658671 is a deficient number, since it is larger than the sum of its proper divisors (1).

491741658671 is an equidigital number, since it uses as much as digits as its factorization.

491741658671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 59.

The spelling of 491741658671 in words is "four hundred ninety-one billion, seven hundred forty-one million, six hundred fifty-eight thousand, six hundred seventy-one".