491316489 has 64 divisors (see below), whose sum is σ = 782745600. Its totient is φ = 304041600.

The previous prime is 491316487. The next prime is 491316491. The reversal of 491316489 is 984613194.

It is an interprime number because it is at equal distance from previous prime (491316487) and next prime (491316491).

It is not a de Polignac number, because 491316489 - 2¹ = 491316487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491316487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3534582 + ... + 3534720.

It is an arithmetic number, because the mean of its divisors is an integer number (12230400).

Almost surely, 2^491316489 is an apocalyptic number.

It is an amenable number.

491316489 is a deficient number, since it is larger than the sum of its proper divisors (291429111).

491316489 is a wasteful number, since it uses less digits than its factorization.

491316489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 317 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 491316489 is about 22165.6601300300. The cubic root of 491316489 is about 789.0789292000.

The spelling of 491316489 in words is "four hundred ninety-one million, three hundred sixteen thousand, four hundred eighty-nine".