1085809 has 2 divisors, whose sum is σ = 1085810. Its totient is φ = 1085808.

The previous prime is 1085801. The next prime is 1085813. The reversal of 1085809 is 9085801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815409 + 270400 = 903^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1085809 - 2³ = 1085801 is a prime.

It is an Ulam number.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (1085801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542904 + 542905.

It is an arithmetic number, because the mean of its divisors is an integer number (542905).

2^1085809 is an apocalyptic number.

It is an amenable number.

1085809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085809 is an equidigital number, since it uses as much as digits as its factorization.

1085809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1085809 is about 1042.0215928665. The cubic root of 1085809 is about 102.7821770592.

The spelling of 1085809 in words is "one million, eighty-five thousand, eight hundred nine".