491647321 has 12 divisors (see below), whose sum is σ = 557842432. Its totient is φ = 432531000.

The previous prime is 491647291. The next prime is 491647339. The reversal of 491647321 is 123746194.

It is not a de Polignac number, because 491647321 - 2⁷ = 491647193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491647391) 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 11 ways as a sum of consecutive naturals, for example, 61785 + ... + 69286.

Almost surely, 2^491647321 is an apocalyptic number.

It is an amenable number.

491647321 is a deficient number, since it is larger than the sum of its proper divisors (66195111).

491647321 is a wasteful number, since it uses less digits than its factorization.

491647321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131124 (or 131113 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 491647321 is about 22173.1215889870. The cubic root of 491647321 is about 789.2560003914.

The spelling of 491647321 in words is "four hundred ninety-one million, six hundred forty-seven thousand, three hundred twenty-one".