491641803 has 12 divisors (see below), whose sum is σ = 733057728. Its totient is φ = 317188080.

The previous prime is 491641789. The next prime is 491641811. The reversal of 491641803 is 308146194.

491641803 is a `hidden beast` number, since 4 + 9 + 1 + 641 + 8 + 0 + 3 = 666.

It is not a de Polignac number, because 491641803 - 2¹⁴ = 491625419 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (491641823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 880800 + ... + 881357.

It is an arithmetic number, because the mean of its divisors is an integer number (61088144).

Almost surely, 2^491641803 is an apocalyptic number.

491641803 is a deficient number, since it is larger than the sum of its proper divisors (241415925).

491641803 is a wasteful number, since it uses less digits than its factorization.

491641803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762194 (or 1762191 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 491641803 is about 22172.9971587064. The cubic root of 491641803 is about 789.2530476441.

Adding to 491641803 its reverse (308146194), we get a palindrome (799787997).

The spelling of 491641803 in words is "four hundred ninety-one million, six hundred forty-one thousand, eight hundred three".