865091 has 2 divisors, whose sum is σ = 865092. Its totient is φ = 865090.

The previous prime is 865087. The next prime is 865103. The reversal of 865091 is 190568.

865091 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 is a cyclic number.

It is not a de Polignac number, because 865091 - 2² = 865087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (865001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432545 + 432546.

It is an arithmetic number, because the mean of its divisors is an integer number (432546).

2⁸⁶⁵⁰⁹¹ is an apocalyptic number.

865091 is a deficient number, since it is larger than the sum of its proper divisors (1).

865091 is an equidigital number, since it uses as much as digits as its factorization.

865091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 865091 is about 930.1026825034. The cubic root of 865091 is about 95.2841354816.

The spelling of 865091 in words is "eight hundred sixty-five thousand, ninety-one".