489606891 has 4 divisors (see below), whose sum is σ = 652809192. Its totient is φ = 326404592.

The previous prime is 489606883. The next prime is 489606959. The reversal of 489606891 is 198606984.

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 489606891 - 2³ = 489606883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (489606881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81601146 + ... + 81601151.

It is an arithmetic number, because the mean of its divisors is an integer number (163202298).

Almost surely, 2^489606891 is an apocalyptic number.

489606891 is a deficient number, since it is larger than the sum of its proper divisors (163202301).

489606891 is a wasteful number, since it uses less digits than its factorization.

489606891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163202300.

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 489606891 is about 22127.0624123493. The cubic root of 489606891 is about 788.1626322018.

The spelling of 489606891 in words is "four hundred eighty-nine million, six hundred six thousand, eight hundred ninety-one".