491741658649 has 2 divisors, whose sum is σ = 491741658650. Its totient is φ = 491741658648.

The previous prime is 491741658637. The next prime is 491741658671. The reversal of 491741658649 is 946856147194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349889995225 + 141851663424 = 591515^2 + 376632^2 .

It is a cyclic number.

It is not a de Polignac number, because 491741658649 - 2³³ = 483151724057 is a prime.

It is not a weakly prime, because it can be changed into another prime (491741658049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245870829324 + 245870829325.

It is an arithmetic number, because the mean of its divisors is an integer number (245870829325).

Almost surely, 2^491741658649 is an apocalyptic number.

It is an amenable number.

491741658649 is a deficient number, since it is larger than the sum of its proper divisors (1).

491741658649 is an equidigital number, since it uses as much as digits as its factorization.

491741658649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52254720, while the sum is 64.

The spelling of 491741658649 in words is "four hundred ninety-one billion, seven hundred forty-one million, six hundred fifty-eight thousand, six hundred forty-nine".