859861 has 2 divisors, whose sum is σ = 859862. Its totient is φ = 859860.

The previous prime is 859853. The next prime is 859891. The reversal of 859861 is 168958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481636 + 378225 = 694^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 859861 - 2³ = 859853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 859861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429930 + 429931.

It is an arithmetic number, because the mean of its divisors is an integer number (429931).

2⁸⁵⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

859861 is a deficient number, since it is larger than the sum of its proper divisors (1).

859861 is an equidigital number, since it uses as much as digits as its factorization.

859861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 859861 is about 927.2869027437. The cubic root of 859861 is about 95.0917304194.

The spelling of 859861 in words is "eight hundred fifty-nine thousand, eight hundred sixty-one".