491008389 has 16 divisors (see below), whose sum is σ = 686684928. Its totient is φ = 311712192.

The previous prime is 491008351. The next prime is 491008417. The reversal of 491008389 is 983800194.

It is not a de Polignac number, because 491008389 - 2⁹ = 491007877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491008389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491008319) 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, 41842 + ... + 52275.

It is an arithmetic number, because the mean of its divisors is an integer number (42917808).

Almost surely, 2^491008389 is an apocalyptic number.

It is an amenable number.

491008389 is a deficient number, since it is larger than the sum of its proper divisors (195676539).

491008389 is a wasteful number, since it uses less digits than its factorization.

491008389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94204.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 491008389 is about 22158.7091004869. The cubic root of 491008389 is about 788.9139533581.

The spelling of 491008389 in words is "four hundred ninety-one million, eight thousand, three hundred eighty-nine".