491173 has 4 divisors (see below), whose sum is σ = 508140. Its totient is φ = 474208.

The previous prime is 491171. The next prime is 491201. The reversal of 491173 is 371194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213444 + 277729 = 462^2 + 527^2 .

It is not a de Polignac number, because 491173 - 2¹ = 491171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491171) 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, 8440 + ... + 8497.

It is an arithmetic number, because the mean of its divisors is an integer number (127035).

2⁴⁹¹¹⁷³ is an apocalyptic number.

It is an amenable number.

491173 is a deficient number, since it is larger than the sum of its proper divisors (16967).

491173 is a wasteful number, since it uses less digits than its factorization.

491173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16966.

The product of its digits is 756, while the sum is 25.

The square root of 491173 is about 700.8373563103. The cubic root of 491173 is about 78.9002104877.

The spelling of 491173 in words is "four hundred ninety-one thousand, one hundred seventy-three".