491047 has 4 divisors (see below), whose sum is σ = 492480. Its totient is φ = 489616.

The previous prime is 491041. The next prime is 491059. The reversal of 491047 is 740194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 491047 - 2³ = 491039 is a prime.

It is a super-2 number, since 2×491047² = 482254312418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491041) 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, 138 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2⁴⁹¹⁰⁴⁷ is an apocalyptic number.

491047 is a deficient number, since it is larger than the sum of its proper divisors (1433).

491047 is an equidigital number, since it uses as much as digits as its factorization.

491047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 491047 is about 700.7474580760. The cubic root of 491047 is about 78.8934631863.

The spelling of 491047 in words is "four hundred ninety-one thousand, forty-seven".