491782281 has 16 divisors (see below), whose sum is σ = 682927488. Its totient is φ = 314496000.

The previous prime is 491782267. The next prime is 491782321. The reversal of 491782281 is 182287194.

It is not a de Polignac number, because 491782281 - 2⁷ = 491782153 is a prime.

It is a super-2 number, since 2×491782281² = 483699623811125922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491782241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23320 + ... + 39081.

It is an arithmetic number, because the mean of its divisors is an integer number (42682968).

Almost surely, 2^491782281 is an apocalyptic number.

It is an amenable number.

491782281 is a deficient number, since it is larger than the sum of its proper divisors (191145207).

491782281 is a wasteful number, since it uses less digits than its factorization.

491782281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62512.

The product of its digits is 64512, while the sum is 42.

The square root of 491782281 is about 22176.1647044749. The cubic root of 491782281 is about 789.3282122122.

The spelling of 491782281 in words is "four hundred ninety-one million, seven hundred eighty-two thousand, two hundred eighty-one".