491186411 has 2 divisors, whose sum is σ = 491186412. Its totient is φ = 491186410.

The previous prime is 491186357. The next prime is 491186429. The reversal of 491186411 is 114681194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491186411 is a prime.

It is a Sophie Germain prime.

It is equal to p_25915706 and since 491186411 and 25915706 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 (491186441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245593205 + 245593206.

It is an arithmetic number, because the mean of its divisors is an integer number (245593206).

Almost surely, 2^491186411 is an apocalyptic number.

491186411 is a deficient number, since it is larger than the sum of its proper divisors (1).

491186411 is an equidigital number, since it uses as much as digits as its factorization.

491186411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 491186411 is about 22162.7257123306. The cubic root of 491186411 is about 789.0092857890.

The spelling of 491186411 in words is "four hundred ninety-one million, one hundred eighty-six thousand, four hundred eleven".