491000128 has 28 divisors (see below), whose sum is σ = 1025611360. Its totient is φ = 232578432.

The previous prime is 491000119. The next prime is 491000177. The reversal of 491000128 is 821000194.

It is a happy number.

It is a super-2 number, since 2×491000128² = 482162251392032768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200676 + ... + 203107.

Almost surely, 2^491000128 is an apocalyptic number.

It is an amenable number.

491000128 is an abundant number, since it is smaller than the sum of its proper divisors (534611232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491000128 is a wasteful number, since it uses less digits than its factorization.

491000128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403814 (or 403804 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 491000128 is about 22158.5226944397. The cubic root of 491000128 is about 788.9095289566.

The spelling of 491000128 in words is "four hundred ninety-one million, one hundred twenty-eight", and thus it is an aban number.