489645581 has 8 divisors (see below), whose sum is σ = 498257760. Its totient is φ = 481071888.

The previous prime is 489645557. The next prime is 489645587. The reversal of 489645581 is 185546984.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 489645581 - 2⁶ = 489645517 is a prime.

It is a super-2 number, since 2×489645581² = 479505589985655122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489645587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16670 + ... + 35456.

It is an arithmetic number, because the mean of its divisors is an integer number (62282220).

Almost surely, 2^489645581 is an apocalyptic number.

It is an amenable number.

489645581 is a deficient number, since it is larger than the sum of its proper divisors (8612179).

489645581 is a wasteful number, since it uses less digits than its factorization.

489645581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19243.

The product of its digits is 1382400, while the sum is 50.

The square root of 489645581 is about 22127.9366638645. The cubic root of 489645581 is about 788.1833925367.

It can be divided in two parts, 48964 and 5581, that added together give a palindrome (54545).

The spelling of 489645581 in words is "four hundred eighty-nine million, six hundred forty-five thousand, five hundred eighty-one".