605661 has 16 divisors (see below), whose sum is σ = 933888. Its totient is φ = 342000.

The previous prime is 605641. The next prime is 605687. The reversal of 605661 is 166506.

It is not a de Polignac number, because 605661 - 2⁵ = 605629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605641) 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 15 ways as a sum of consecutive naturals, for example, 3076 + ... + 3266.

It is an arithmetic number, because the mean of its divisors is an integer number (58368).

2⁶⁰⁵⁶⁶¹ is an apocalyptic number.

It is an amenable number.

605661 is a deficient number, since it is larger than the sum of its proper divisors (328227).

605661 is a wasteful number, since it uses less digits than its factorization.

605661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 605661 is about 778.2422502023. The cubic root of 605661 is about 84.6076962076.

The spelling of 605661 in words is "six hundred five thousand, six hundred sixty-one".