491668759 has 2 divisors, whose sum is σ = 491668760. Its totient is φ = 491668758.

The previous prime is 491668729. The next prime is 491668777. The reversal of 491668759 is 957866194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491668759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491668729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245834379 + 245834380.

It is an arithmetic number, because the mean of its divisors is an integer number (245834380).

Almost surely, 2^491668759 is an apocalyptic number.

491668759 is a deficient number, since it is larger than the sum of its proper divisors (1).

491668759 is an equidigital number, since it uses as much as digits as its factorization.

491668759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The square root of 491668759 is about 22173.6050068544. The cubic root of 491668759 is about 789.2674719101.

The spelling of 491668759 in words is "four hundred ninety-one million, six hundred sixty-eight thousand, seven hundred fifty-nine".