491558 has 8 divisors (see below), whose sum is σ = 744552. Its totient is φ = 243376.

The previous prime is 491539. The next prime is 491581. The reversal of 491558 is 855194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 935 + ... + 1362.

It is an arithmetic number, because the mean of its divisors is an integer number (93069).

2⁴⁹¹⁵⁵⁸ is an apocalyptic number.

491558 is a deficient number, since it is larger than the sum of its proper divisors (252994).

491558 is a wasteful number, since it uses less digits than its factorization.

491558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406.

The product of its digits is 7200, while the sum is 32.

The square root of 491558 is about 701.1119739385. Note that the first 3 decimals coincide. The cubic root of 491558 is about 78.9208200948.

The spelling of 491558 in words is "four hundred ninety-one thousand, five hundred fifty-eight".