491611 has 2 divisors, whose sum is σ = 491612. Its totient is φ = 491610.

The previous prime is 491593. The next prime is 491627. The reversal of 491611 is 116194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491611 - 2⁷ = 491483 is a prime.

It is a Chen prime.

It is equal to p₄₀₈₉₁ and since 491611 and 40891 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 (491651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245805 + 245806.

It is an arithmetic number, because the mean of its divisors is an integer number (245806).

2⁴⁹¹⁶¹¹ is an apocalyptic number.

491611 is a deficient number, since it is larger than the sum of its proper divisors (1).

491611 is an equidigital number, since it uses as much as digits as its factorization.

491611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 491611 is about 701.1497700206. The cubic root of 491611 is about 78.9236564187.

The spelling of 491611 in words is "four hundred ninety-one thousand, six hundred eleven".