489661 has 4 divisors (see below), whose sum is σ = 491452. Its totient is φ = 487872.

The previous prime is 489659. The next prime is 489673. The reversal of 489661 is 166984.

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 337561 + 152100 = 581^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 489661 - 2¹ = 489659 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (489631) 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 3 ways as a sum of consecutive naturals, for example, 390 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (122863).

2⁴⁸⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

489661 is a deficient number, since it is larger than the sum of its proper divisors (1791).

489661 is a wasteful number, since it uses less digits than its factorization.

489661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1790.

The product of its digits is 10368, while the sum is 34.

The square root of 489661 is about 699.7578152475. The cubic root of 489661 is about 78.8191665781.

The spelling of 489661 in words is "four hundred eighty-nine thousand, six hundred sixty-one".