491349673 has 2 divisors, whose sum is σ = 491349674. Its totient is φ = 491349672.

The previous prime is 491349647. The next prime is 491349689. The reversal of 491349673 is 376943194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328225689 + 163123984 = 18117^2 + 12772^2 .

It is a cyclic number.

It is not a de Polignac number, because 491349673 - 2¹³ = 491341481 is a prime.

It is not a weakly prime, because it can be changed into another prime (491349373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245674836 + 245674837.

It is an arithmetic number, because the mean of its divisors is an integer number (245674837).

Almost surely, 2^491349673 is an apocalyptic number.

It is an amenable number.

491349673 is a deficient number, since it is larger than the sum of its proper divisors (1).

491349673 is an equidigital number, since it uses as much as digits as its factorization.

491349673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 491349673 is about 22166.4086626589. The cubic root of 491349673 is about 789.0966938563.

The spelling of 491349673 in words is "four hundred ninety-one million, three hundred forty-nine thousand, six hundred seventy-three".