491899803 has 4 divisors (see below), whose sum is σ = 655866408. Its totient is φ = 327933200.

The previous prime is 491899789. The next prime is 491899813. The reversal of 491899803 is 308998194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491899803 - 2⁴ = 491899787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491899813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81983298 + ... + 81983303.

It is an arithmetic number, because the mean of its divisors is an integer number (163966602).

Almost surely, 2^491899803 is an apocalyptic number.

491899803 is a deficient number, since it is larger than the sum of its proper divisors (163966605).

491899803 is a wasteful number, since it uses less digits than its factorization.

491899803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163966604.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 491899803 is about 22178.8142830044. The cubic root of 491899803 is about 789.3910828804.

The spelling of 491899803 in words is "four hundred ninety-one million, eight hundred ninety-nine thousand, eight hundred three".