659561 has 8 divisors (see below), whose sum is σ = 767040. Its totient is φ = 555408.

The previous prime is 659539. The next prime is 659563. The reversal of 659561 is 165956.

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

It is not a de Polignac number, because 659561 - 2⁶ = 659497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (659563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (95880).

2⁶⁵⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

659561 is a deficient number, since it is larger than the sum of its proper divisors (107479).

659561 is a wasteful number, since it uses less digits than its factorization.

659561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663.

The product of its digits is 8100, while the sum is 32.

The square root of 659561 is about 812.1336096973. The cubic root of 659561 is about 87.0465686301.

The spelling of 659561 in words is "six hundred fifty-nine thousand, five hundred sixty-one".