859669 has 2 divisors, whose sum is σ = 859670. Its totient is φ = 859668.

The previous prime is 859667. The next prime is 859679. The reversal of 859669 is 966958.

859669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 786769 + 72900 = 887^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 859669 - 2¹ = 859667 is a prime.

It is a super-2 number, since 2×859669² = 1478061579122, which contains 22 as substring.

Together with 859667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429834 + 429835.

It is an arithmetic number, because the mean of its divisors is an integer number (429835).

2⁸⁵⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

859669 is a deficient number, since it is larger than the sum of its proper divisors (1).

859669 is an equidigital number, since it uses as much as digits as its factorization.

859669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 859669 is about 927.1833691347. The cubic root of 859669 is about 95.0846521546.

The spelling of 859669 in words is "eight hundred fifty-nine thousand, six hundred sixty-nine".