859561 has 2 divisors, whose sum is σ = 859562. Its totient is φ = 859560.

The previous prime is 859559. The next prime is 859567. The reversal of 859561 is 165958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 281961 = 760^2 + 531^2 .

It is a cyclic number.

It is not a de Polignac number, because 859561 - 2¹ = 859559 is a prime.

It is a super-2 number, since 2×859561² = 1477690225442, which contains 22 as substring.

Together with 859559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (859567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429780 + 429781.

It is an arithmetic number, because the mean of its divisors is an integer number (429781).

2⁸⁵⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

859561 is a deficient number, since it is larger than the sum of its proper divisors (1).

859561 is an equidigital number, since it uses as much as digits as its factorization.

859561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 859561 is about 927.1251263988. The cubic root of 859561 is about 95.0806701676.

The spelling of 859561 in words is "eight hundred fifty-nine thousand, five hundred sixty-one".