859961 has 4 divisors (see below), whose sum is σ = 861924. Its totient is φ = 858000.

The previous prime is 859939. The next prime is 859973. The reversal of 859961 is 169958.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169958 = 2 ⋅84979.

It can be written as a sum of positive squares in 2 ways, for example, as 250000 + 609961 = 500^2 + 781^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (859981) 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, 11 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (215481).

2⁸⁵⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

859961 is a deficient number, since it is larger than the sum of its proper divisors (1963).

859961 is a wasteful number, since it uses less digits than its factorization.

859961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1962.

The product of its digits is 19440, while the sum is 38.

The square root of 859961 is about 927.3408219204. The cubic root of 859961 is about 95.0954165983.

The spelling of 859961 in words is "eight hundred fifty-nine thousand, nine hundred sixty-one".