491800193 has 2 divisors, whose sum is σ = 491800194. Its totient is φ = 491800192.

The previous prime is 491800187. The next prime is 491800219. The reversal of 491800193 is 391008194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387617344 + 104182849 = 19688^2 + 10207^2 .

It is a cyclic number.

It is not a de Polignac number, because 491800193 - 2¹⁰ = 491799169 is a prime.

It is a Chen prime.

It is equal to p_25946270 and since 491800193 and 25946270 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (491800163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245900096 + 245900097.

It is an arithmetic number, because the mean of its divisors is an integer number (245900097).

Almost surely, 2^491800193 is an apocalyptic number.

It is an amenable number.

491800193 is a deficient number, since it is larger than the sum of its proper divisors (1).

491800193 is an equidigital number, since it uses as much as digits as its factorization.

491800193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 491800193 is about 22176.5685578270. The cubic root of 491800193 is about 789.3377952302.

The spelling of 491800193 in words is "four hundred ninety-one million, eight hundred thousand, one hundred ninety-three".