491506 has 4 divisors (see below), whose sum is σ = 737262. Its totient is φ = 245752.

The previous prime is 491503. The next prime is 491527. The reversal of 491506 is 605194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605194 = 2 ⋅302597.

It can be written as a sum of positive squares in only one way, i.e., 297025 + 194481 = 545^2 + 441^2 .

It is not an unprimeable number, because it can be changed into a prime (491501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122875 + ... + 122878.

2⁴⁹¹⁵⁰⁶ is an apocalyptic number.

491506 is a deficient number, since it is larger than the sum of its proper divisors (245756).

491506 is a wasteful number, since it uses less digits than its factorization.

491506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245755.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 491506 is about 701.0748890097. The cubic root of 491506 is about 78.9180370883.

The spelling of 491506 in words is "four hundred ninety-one thousand, five hundred six".