489161689 has 9 divisors (see below), whose sum is σ = 520028221. Its totient is φ = 460033600.

The previous prime is 489161683. The next prime is 489161737. The reversal of 489161689 is 986161984.

The square root of 489161689 is 22117.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 92833225 + 396328464 = 9635^2 + 19908^2 .

It is not a de Polignac number, because 489161689 - 2³ = 489161681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (489161681) 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 8 ways as a sum of consecutive naturals, for example, 375339 + ... + 376639.

Almost surely, 2^489161689 is an apocalyptic number.

489161689 is the 22117-th square number.

489161689 is the 11059-th centered octagonal number.

It is an amenable number.

489161689 is a deficient number, since it is larger than the sum of its proper divisors (30866532).

489161689 is an frugal number, since it uses more digits than its factorization.

489161689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2636 (or 1318 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The cubic root of 489161689 is about 787.9236663456.

Multiplying 489161689 by its product of digits (746496), we get a square (365157244191744 = 19109088²).

It can be divided in two parts, 48916 and 1689, that added together give a palindrome (50605).

The spelling of 489161689 in words is "four hundred eighty-nine million, one hundred sixty-one thousand, six hundred eighty-nine".