859091 has 2 divisors, whose sum is σ = 859092. Its totient is φ = 859090.

The previous prime is 859081. The next prime is 859093. The reversal of 859091 is 190958.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859091 is a prime.

Together with 859093, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₆₈₂₇₉ and since 859091 and 68279 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (859093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429545 + 429546.

It is an arithmetic number, because the mean of its divisors is an integer number (429546).

2⁸⁵⁹⁰⁹¹ is an apocalyptic number.

859091 is a deficient number, since it is larger than the sum of its proper divisors (1).

859091 is an equidigital number, since it uses as much as digits as its factorization.

859091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 859091 is about 926.8716200208. The cubic root of 859091 is about 95.0633372645.

The spelling of 859091 in words is "eight hundred fifty-nine thousand, ninety-one".