489924661 has 4 divisors (see below), whose sum is σ = 492064300. Its totient is φ = 487785024.

The previous prime is 489924647. The next prime is 489924691. The reversal of 489924661 is 166429984.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240095025 + 249829636 = 15495^2 + 15806^2 .

It is a cyclic number.

It is not a de Polignac number, because 489924661 - 2⁵ = 489924629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489924691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069476 + ... + 1069933.

It is an arithmetic number, because the mean of its divisors is an integer number (123016075).

Almost surely, 2^489924661 is an apocalyptic number.

It is an amenable number.

489924661 is a deficient number, since it is larger than the sum of its proper divisors (2139639).

489924661 is a wasteful number, since it uses less digits than its factorization.

489924661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139638.

The product of its digits is 746496, while the sum is 49.

The square root of 489924661 is about 22134.2418212145. The cubic root of 489924661 is about 788.3331092924. Note that the first 3 decimals are identical.

The spelling of 489924661 in words is "four hundred eighty-nine million, nine hundred twenty-four thousand, six hundred sixty-one".