859661 has 8 divisors (see below), whose sum is σ = 968448. Its totient is φ = 756000.

The previous prime is 859657. The next prime is 859667. The reversal of 859661 is 166958.

859661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 859661 - 2² = 859657 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 (859667) 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, 920 + ... + 1601.

It is an arithmetic number, because the mean of its divisors is an integer number (121056).

2⁸⁵⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

859661 is a deficient number, since it is larger than the sum of its proper divisors (108787).

859661 is a wasteful number, since it uses less digits than its factorization.

859661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563.

The product of its digits is 12960, while the sum is 35.

The square root of 859661 is about 927.1790549834. The cubic root of 859661 is about 95.0843572041.

The spelling of 859661 in words is "eight hundred fifty-nine thousand, six hundred sixty-one".