491161 has 4 divisors (see below), whose sum is σ = 535824. Its totient is φ = 446500.

The previous prime is 491159. The next prime is 491167. The reversal of 491161 is 161194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491161 - 2¹ = 491159 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22315 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (133956).

2⁴⁹¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

491161 is a deficient number, since it is larger than the sum of its proper divisors (44663).

491161 is a wasteful number, since it uses less digits than its factorization.

491161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44662.

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

The square root of 491161 is about 700.8287950705. The cubic root of 491161 is about 78.8995679372.

The spelling of 491161 in words is "four hundred ninety-one thousand, one hundred sixty-one".