859023509 has 2 divisors, whose sum is σ = 859023510. Its totient is φ = 859023508.

The previous prime is 859023493. The next prime is 859023511. The reversal of 859023509 is 905320958.

859023509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539400625 + 319622884 = 23225^2 + 17878^2 .

It is a cyclic number.

It is not a de Polignac number, because 859023509 - 2⁴ = 859023493 is a prime.

Together with 859023511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (859025509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429511754 + 429511755.

It is an arithmetic number, because the mean of its divisors is an integer number (429511755).

Almost surely, 2^859023509 is an apocalyptic number.

It is an amenable number.

859023509 is a deficient number, since it is larger than the sum of its proper divisors (1).

859023509 is an equidigital number, since it uses as much as digits as its factorization.

859023509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 859023509 is about 29309.1028351262. The cubic root of 859023509 is about 950.6084777750.

The spelling of 859023509 in words is "eight hundred fifty-nine million, twenty-three thousand, five hundred nine".