491846657 has 2 divisors, whose sum is σ = 491846658. Its totient is φ = 491846656.

The previous prime is 491846573. The next prime is 491846671. The reversal of 491846657 is 756648194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418161601 + 73685056 = 20449^2 + 8584^2 .

It is a cyclic number.

It is not a de Polignac number, because 491846657 - 2⁸ = 491846401 is a prime.

It is a Chen prime.

It is equal to p_25948589 and since 491846657 and 25948589 have the same sum of digits, it is a Honaker prime.

It is a weakly prime.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245923328 + 245923329.

It is an arithmetic number, because the mean of its divisors is an integer number (245923329).

Almost surely, 2^491846657 is an apocalyptic number.

It is an amenable number.

491846657 is a deficient number, since it is larger than the sum of its proper divisors (1).

491846657 is an equidigital number, since it uses as much as digits as its factorization.

491846657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 50.

The square root of 491846657 is about 22177.6161252737. The cubic root of 491846657 is about 789.3626526397.

The spelling of 491846657 in words is "four hundred ninety-one million, eight hundred forty-six thousand, six hundred fifty-seven".